Scientists in a Central American country are studying factors that may be associated with delayed physical growth among a group of low-income children. The Study children live in a region of the nation that has high levels of lead in drinking water. This study is an example of alan) Multiple Choice uncontrollable epidemiological conversational prospective
The study described is an example of an observational epidemiological study.
Observational studies involve observing and collecting data on individuals without intervening or manipulating any variables. In this case, the scientists are observing and collecting data on a group of low-income children to investigate factors that may be associated with delayed physical growth. The study is also longitudinal in nature, meaning that data is collected over a period of time to track changes in the children's growth and health outcomes. The study is not experimental, as the scientists are not manipulating any variables and are simply observing the children in their natural environment.
An example of an observational epidemiological study is the one just outlined.
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You end up with two DNA molecules at the end. Do they have the same genetic information or are
they different?
Answer:
Both strands of double-stranded DNA store the same biological information. This information is replicated when the two strands separate.
Explanation:
What would you need to add to your brain model in order to create a model of the central nervous system? To which brain area would you connect it?
Answer:
To create a model of the central nervous system, you would need to add the spinal cord to your brain model. The spinal cord is a long, thin, tubular bundle of nervous tissue that extends from the brainstem to the lower back and is responsible for transmitting signals between the brain and the rest of the body. By adding the spinal cord to your brain model, you would create a model of the central nervous system that includes both the brain and spinal cord, and their integration and regulation of the body's many functions.
You would connect the spinal cord to the brainstem in your model of the central nervous system. The brainstem is the lower part of the brain that is continuous with the spinal cord and is responsible for many vital functions, such as breathing, heart rate, and blood pressure, and is also involved in the transmission of sensory and motor signals between the brain and the body. By connecting the spinal cord to the brainstem in your model, you would establish the important link between the brain and the rest of the body.
Use the following table to answer the question This table shows the codons found in messenger RNA Using this information what sequence of nucleotides in the template strand of DNA could code for the polypeptide sequence Phe-Ser-Gin
UUC-UCU-CAA
AAG-AGA-GTT
TTC-TCT-CAA
AAG-AGA-GUU
The correct response is 5'-CTTCGGGAA-3' since GAA-CGG-CTT codes to Phe-Pro-Lys. Given that the DNA template thread is always in reverse, the sequence GAA-CGG-CTT would be organised that manner.
The genome's protein-coding sequence is found in which section of DNA?Genes and intergenic gaps make up the eukaryotic DNA. Exons and introns are additional divisions of genes. Exons are also known as protein-coding sections 1, 2, and 3 since they contain the protein-production code.
What is the coding strand of the DNA sequence?The coding strand is the DNA helix with such a base sequence similar to its primary transcript (RNA). Whereas this strand has codons, the non-coding thread has anticodons. The coding strand serves as a model for creating the complementary strand.
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Iridium is an element that is rare on Earth but commonly found in meteorites. A scientist believes that the first organic molecules may have come to Earth on meteorites 3. 6 billion years ago. Which of these would be an appropriate null hypothesis to test related to whether meteorites hit the Earth 3. 6 billion years ago?
If sediment layers that are 3. 6 billion years old are tested, they will contain relatively high iridium levels, because that is when many meteorites crashed into the Earth.
A
There is no difference in iridium levels in sediments that were deposited on Earth 3. 6 billion years old, compared to recent sediments.
B
If a sediment layer that is 3. 6 billion years old is tested, it will contain organic material.
C
If recently fallen meteorites and meteoroids collected in space are tested, they will not contain organic molecules
The appropriate null hypothesis is:
There is no difference in iridium levels in sediments that were deposited on Earth 3. 6 billion years old, compared to recent sediments.The correct option is A.
What is an appropriate null hypothesis?The assertion that there is no correlation between any two groups of data or variables under investigation is known as a null hypothesis.
A would be the appropriate null hypothesis to test related to whether meteorites hit the Earth 3.6 billion years ago. It proposes that there is no difference in iridium levels in sediments that were deposited on Earth 3.6 billion years ago, compared to recent sediments. By testing this null hypothesis, scientists can determine whether the high iridium levels found in sediment layers of that age are due to a large influx of meteorites or some other factor.
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FILL IN THE BLANK. A newly discovered fungal pathogen has recently begun to infect and kill many species of amphibians. When the pathogen infects a new amphibian species, it evolves specialized defenses against that amphibian species' immune system. This specialization makes strains of this pathogen on one amphibian species genetically distinct and unable to interbreed with pathogens on different amphibian species. Further, once the pathogen infects an individual, populations in different parts of their host's body evolve uniquely to deal with different environmental challenges. While individuals in different parts of the host's body are still genetically similar enough to interbreed, they end up having very different phenotypes. The two broad types of evolution occurring in this pathogen are _____ speciation and _____ by _____ selection.
The two broad types of evolution occurring in this pathogen are allopatric speciation and adaptation by natural selection.
Allopatric speciation occurs when a population becomes geographically isolated and diverges genetically, leading to the formation of new species. In the case of the fungal pathogen, the different amphibian species act as geographic barriers, causing the pathogen to evolve specialized defenses against each amphibian species' immune system and leading to the formation of genetically distinct strains of the pathogen that are unable to interbreed.
Adaptation by natural selection occurs when individuals with certain traits are better suited to their environment and are therefore more likely to survive and reproduce.
In the case of the fungal pathogen, populations in different parts of the host's body are exposed to different environmental challenges and evolve uniquely to deal with these challenges. While these populations are still genetically similar enough to interbreed, they end up having very different phenotypes due to natural selection.
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John doesn’t think that skepticism should play an important role in the scientific process. He says that skepticism interferes with scientific consensus. Which statement best describes John’s conclusion?
It is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.
It is correct because skepticism prevents the acceptance of creative ideas and new discoveries.
It is correct because skepticism prevents scientists from testing new ideas and communicating with other scientists.
It is incorrect because skepticism leads to the acceptance of new ideas, which can eventually gain scientific consensus.
On Earth the force of gravity is measured in Newtons, 1 kilogram of mass equal approximately 10 Newtons.
If an object had a mass of 5 kilograms, what would be the weight of the object measured on a spring scale in the unit of Newtons?
If an object had a mass of 5 kilograms, the weight of the object measured on a spring scale in the unit of Newtons is 50N.
The force that causes a mass of one kilogramme to accelerate by one metre per second per second is known as 1 kgm/s2. It bears Isaac Newton's name in honour of his contributions to classical mechanics, particularly Newton's second rule of motion.
we have 1 kg = 10 N
so 5 kg = 5 x 10 = 50 N.
The force exerted on an item by gravity is known as its weight.
Weight is sometimes described as a vector quantity, or the gravitational force exerted on the object, in certain common textbooks. Some people refer to weight as a scalar quantity that measures the gravitational force's strength. Others describe it as the strength of the force applied to a body by systems that work to counteract the effects of gravity. For example, a spring scale measures weight. As a result, the weight would be zero during free fall.
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Traits acquired during an organisms lifetime can be passed down to its offspring true or false
Answer:
False
Explanation:
An acquired trait is the character developed in an individual as a result of environmental influence. These traits are not coded by the DNA of a living organism and therefore cannot be passed on to future generations.
1. According to the map, what was the change in the length of Canada's ragweed pollen season from 1995 to 2015?
Answer:
six to 25 days
Explanation:
U.S. and Canadian researchers reported in 2016 that ragweed pollen seasons had grown longer, by six to 25 days, in 10 U.S. and Canadian locations between 1995-2015
Bacteria and archaea together make up the most widespread group of
organisms on Earth, the
a. eukaryotes.
b. prokaryotes.
c. viruses.
d. pathogens.
The correct answer is b. prokaryotes.
Eukaryotic v.s. ProkaryoticYou can recall that there are two major different types of cells: eukaryotic cells and prokaryotic cells. Eukaryotic cells have a nucleus, and prokaryotic cells do not have a nucleus.
Bacteria, such as the streptococcus bacteria (which causes infections like strep throat and rheumatic fever), do not have a nucleus. This sets them apart from other types of cells. For instance, white blood cells (WBCs) do have a nucleus, but red blood cells do not.
Since bacteria are prokaryotic (do not have a nucleus), we cannot categorize them as eukaryotic. This renders option A incorrect.
Bacteria v.s. VirusesBacteria and viruses are also contrasting. Bacteria cause infections like pneumonia and skin infections (such as cellulitis), but viruses are in charge of most upper respiratory infections (URIs), like the common cold or the Novel Coronavirus.
As such, bacteria cannot be categorized under the viruses category. This means that option C cannot be correct.
Are archaea pathogenic?Pathogens are different biological microorganisms that can cause infections. Both viruses and bacteria fall under this category. However, archaea are not known to create any type of disease in humans and are therefore marked as non-pathogenic.
As such, bacteria and archaea cannot make up a group of pathogenic organisms, so this means that option D is also incorrect.
The final answer choice that is correct is b. prokaryotes.
Which type of gated channel remains open longer? To determine this, use the sliding tool on the membrane potential vs time chart and make note of when each gated channel opens and then closes. Pay special attention to the sodium gated channel, as it has a different mechanism for locking compared to potassium’s.
Compared to sodium and potassium channels, voltage-gated calcium channels tend to stay open longer. This is due to the slower inflow and outflow rates of calcium ions relative to sodium and potassium ions.
What kind of channels are open all the time and are not gated?Ion channels that are non-gated are constantly open. These channels are also known as "leak" channels since they do not impose any resistance on the ions as they move through them.
What causes the ion channels involved in creating action potentials to open or close?Several types of channels open and close in response to neurotransmitters, hormones, changes in membrane potential, mechanical pressures, and other agents. This results in the generation and modulation of electrical signals. Voltage-gated and ligand-gated ion channels are the two main kinds of ion channels.
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Feeling a gentle caress on your arm would likely involve all of the following EXCEPT ________.
Select one:
a. Hair follicle receptors
b. Tactile discs
c. Lamellar corpuscles
d. Meissner's corpuscles
The answer is C. Lamellar corpuscles would likely not be involved in feeling a gentle caress on your arm.
Lamellar corpuscles, also known as Pacinian corpuscles, are sensory receptors that are located deep within the skin and respond to deep pressure and vibration. In contrast, a gentle caress on the arm would involve the activation of other types of sensory receptors, such as hair follicle receptors, tactile discs, and Meissner's corpuscles.
Hair follicle receptors are sensory receptors located at the base of hair follicles and respond to hair movements, such as when a gentle breeze moves the hairs on the skin. Tactile discs, also known as Merkel cells, are located in the upper layers of the skin and respond to pressure and texture. Meissner's corpuscles are also located in the upper layers of the skin and respond to light touch and changes in texture.
Therefore, a gentle caress on the arm would likely involve the activation of hair follicle receptors, tactile discs, and Meissner's corpuscles, but not lamellar corpuscles.
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In the processes of photosynthesis and cellular respiration, carbon is cycled between all major spheres on Earth. Plants obtain carbon dioxide from the atmosphere as one reactant to conduct photosynthesis. Carbon dioxide is produced by organisms as a result of carrying out cellular respiration. Which claim is correct about the cycling of matter and the flow of energy in the carbon cycle?
Carbon dioxide is produced by organisms as a result of carrying out cellular respiration is correct about the cycling of matter and the flow of energy in the carbon cycle.
Organic molecules are created from carbon dioxide or bicarbonate during photosynthesis in terrestrial plants, microorganisms, and algae. Via food chains, photosynthesizing organisms produce organic compounds that are then transformed back into carbon dioxide gas by cellular respiration.
While cellular respiration emits carbon dioxide into the environment, photosynthesis removes it from the atmosphere. carbon cycle. Worldwide, cellular respiration and photosynthesis exchange carbon dioxide and oxygen to maintain stable levels of atmospheric oxygen and carbon dioxide.
Cellular respiration is the process through which glucose is broken down, and it produces carbon dioxide as a byproduct. Humans return carbon to the carbon cycle through the exhalation of carbon dioxide. aThrough a process known as photosynthesis, plants are able to catch this carbon dioxide and utilise it to create carbohydrates.
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A cell has detected a problem: One segment of its copied DNA contains an error. The cell is at which checkpoint in the cell cycle?
A. M checkpoint
B. Go checkpoint
C. G₂ checkpoint
D. G₁ checkpoint
which one is please help
Answer:The answer is C
Explanation:
Explain atoms, molecules, cells, tissue, organs, organ systems and organisms. Relationships of living things
The relationships of living things are complex and interconnected. Atoms combine to form molecules, which combine to form cells, which work together to form tissues, organs, and organ systems.
Atoms are the smallest unit of matter that retain the properties of an element. They are the building blocks of everything in the universe and are composed of a nucleus containing positively charged protons and neutrally charged neutrons, surrounded by negatively charged electrons.
Molecules are formed when two or more atoms combine chemically through covalent, ionic or hydrogen bonding to form a stable unit. Molecules can be made up of the same type of atoms (such as O2) or different types of atoms (such as H2O).
Cells are the basic structural and functional unit of life. They are the smallest unit of life that can perform all the necessary functions, such as growth, metabolism, and reproduction. Cells are divided into two main types: prokaryotic and eukaryotic.
Tissues are a group of similar cells that work together to perform a specific function. For example, muscle tissue is composed of muscle cells that work together to allow movement.
Organs are made up of several different tissues that work together to perform a specific function. For example, the heart is an organ composed of muscle tissue, nervous tissue, and connective tissue that work together to pump blood throughout the body.
Organ systems are a group of organs that work together to perform a specific function. For example, the circulatory system is composed of the heart, blood vessels, and blood, and works to transport oxygen and nutrients throughout the body.
An organism is a living thing composed of one or more cells. Organisms can be unicellular, such as bacteria or amoeba, or multicellular, such as plants or animals. Organisms can also be classified into different kingdoms, such as animalia, plantae, fungi, protista, and monera.
Organisms are composed of many organ systems working together to maintain homeostasis and survive in their environment. Additionally, living things can interact with each other and their environment in complex ways, such as through predation, competition, symbiosis, and mutualism.
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For a substance to be a mineral, it must have at least one of these 5 characteristics:
1. Naturally Ocurring
2. Solid
3. Forms by inorganic process
4. Crystal Structure
5. Definite Chemical Composition
True or false
Pls answer quick i have a test
True. For a substance to be considered a mineral, it must possess all five of the given characteristic i.e, Naturally Ocurring, Solid, Forms by inorganic process Crystal Structure and Definite Chemical Composition.
Explain all these given 5 characteristics in detail?
Naturally Occurring: The substance must occur naturally and not be created or significantly altered by humans.Solid: The substance must be a solid at room temperature.Inorganic: The substance must be formed by geological processes and not be the result of a biological process.Crystalline Structure: The substance must have a regular and repeating atomic arrangement, also known as a crystalline structure.Definite Chemical Composition: The substance must have a specific chemical formula or range of chemical compositions.To learn more about Crystal Structure, visit: https://brainly.com/question/27720879
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A mutation caused by a piece of DNA breaking away from its chromosome and becoming attached to a nonhomologous chromosome as demonstrated from the text figure and lecture is called
A mutation caused by a piece of DNA breaking away from its chromosome and becoming attached to a non-homologous chromosome is translocation.
Translocation is a type of genetic alteration when a segment of one chromosome separates and joins another. Chromosomes from different species can occasionally swap portions with one another. Refer the image for the same.
Medical conditions include leukaemia, breast cancer, schizophrenia, muscular dystrophy, and Down syndrome may result from translocations. The term "mutation" refers to an organism's abrupt, stable, discontinuous, and inheritable alterations brought on by a permanent change in genotype.
Normally, a genetic mutation modifies the messages that are sent by a gene. Just the number of positions of genes that are already present are changed by chromosomal mutation.
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which are three general mechanisms that appear to be involved in the conversion of proto-oncogenes to oncogenes
Answer:
Point Mutations, Gene Amplification, and Gene Fusion.
Explanation:
Proto-oncogenes are responsible for the specialization and division of cells. Following mutations, they become oncogenes that induce the formation of cancers. The three main methods involved in the conversion of proto-oncogenes into oncogenes are point mutations, gene amplification, and gene fusion.
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100 POINTS please help, info should be pretty short but enough to probably fit on one slide!
My assigned technology is GENE THERAPY!
Include a real-life scenario or “case” to explain how the technology has or is currently being used. For example, for GMOs you might include the scenario of Golden Rice Project to increase vitamin A in communities exhibiting vitamin A deficiency, or for cloning, you might describe the first successful cloning of Dolly the sheep. Your case should include the following:
· When did the scenario/case happen?
· Where did the scenario/case happen?
· Explain the background/details of the case/scenario.
· How was the technology involved in solving the problem or case?
· 2-3 related pictures
Gene therapy is a rapidly evolving technology that has the potential to revolutionize medical treatments. It offers hope to patients with previously untreatable genetic disorders and diseases.
What is blood?Blood is a fluid connective tissue that circulates throughout the body, carrying oxygen, nutrients, and hormones to tissues and organs, while also removing waste products and carbon dioxide from them. It is composed of various types of cells, suspended in a liquid matrix known as plasma.
Here,
Title: Gene Therapy - Revolutionizing Medical Treatments
Introduction:
Gene therapy is a promising technology that involves the delivery of genetic material to cure or prevent diseases. It is an innovative approach to address genetic disorders that were previously untreatable. This technology is being used to treat a variety of diseases, such as genetic disorders, cancer, and viral infections.
Real-life scenario:
In 2017, the US Food and Drug Administration (FDA) approved the first gene therapy for use in the United States. The treatment, called Kymriah, is a type of gene therapy used to treat pediatric acute lymphoblastic leukemia (ALL).
Background/details:
Pediatric ALL is a type of cancer that affects the blood and bone marrow. It is the most common type of cancer in children, accounting for around 25% of all childhood cancer cases. The traditional treatment for ALL involves chemotherapy, radiation, and bone marrow transplant. However, these treatments can be very harsh and can have severe side effects.
How was the technology involved in solving the problem or case?
Gene therapy involves the insertion, removal, or modification of genes within a person's cells and tissues to treat or prevent disease. In the case of Kymriah, the patient's own T-cells (a type of immune cell) are modified with a new gene to target and kill cancer cells. The modified T-cells are then infused back into the patient's body to attack the cancer cells.
Pictures:
Picture 1: A child receiving gene therapy treatment
Picture 2: A lab technician working on gene therapy research
Picture 3: A diagram of the gene therapy process
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Federal aid for the U. S. Fish and Wildlife Service stems from the ____
a. Pittman-Robertson Act
b. Dingell-Johnson Act
c. Neither Anor B
d. Both A and B
Federal aid for the U.S. Fish and Wildlife Service stems from both the Pittman-Robertson Act and the Dingell-Johnson Act. These acts were passed in 1937 and 1950, respectively, and are also known as the Federal Aid in Wildlife Restoration Act and the Federal Aid in Sport Fish Restoration Act.
The Pittman-Robertson Act provides funding for wildlife conservation and restoration through an excise tax on firearms, ammunition, and archery equipment. The Dingell-Johnson Act provides funding for sportfish restoration and conservation through an excise tax on fishing equipment and motorboat fuel.
Both acts are administered by the U.S. Fish and Wildlife Service, and the funds collected are distributed to states and territories for conservation and restoration projects. These acts have been instrumental in the recovery of many wildlife populations and the conservation of their habitats, as well as providing opportunities for recreational fishing and hunting.
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Explain the stages of complete and incomplete metamorphosis, provide examples for each.
The stages of complete and incomplete metamorphosis are provided in the section below.
Stages of complete and incomplete metamorphosisThe transformation of an organism through its whole life cycle, including the various stages of egg, larva, pupa, and adulthood, is known as complete metamorphosis. Butterflies, moths, and beetles are some organisms that undergo complete metamorphosis.
Egg: The life cycle's first stage and the start of the full metamorphosis, respectively. The embryo of the creature is housed inside the egg, which is a tiny, often oval-shaped structure.Learn more about metamorphosis here:
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A
the line on a distance-time graph indicates constant speed because it shows the exact change in
each second.
The statement is partially correct. A line on a distance-time graph does indicate constant speed, but it does not necessarily show the exact change in each second.
How an object moves with constant speed?
When an object moves with constant speed, its distance traveled is directly proportional to the time taken. This means that if we plot the distance traveled by the object on the vertical axis and the time taken on the horizontal axis, the resulting graph will be a straight line with a constant slope.
However, the slope of the line does not necessarily correspond to the exact change in distance per second. It simply indicates the constant speed of the object, which could be measured in any unit of distance per unit of time (e.g. meters per second, miles per hour, etc.).
For example, a line with a slope of 2 on a distance-time graph would indicate that the object is moving at a constant speed of 2 units of distance per unit of time. This could represent 2 meters per second, 2 miles per hour, or any other unit of distance and time.
So, while the line on a distance-time graph does indicate constant speed, it does not necessarily show the exact change in distance per second.
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The water-to-land transition occurred independently several times in the protostomes. Which of these is not an example of an adaptation for terrestrial living that may have arisen by convergent evolution? Eggs with a covering that minimizes water loss Decreased surface-to-volume ratios to increase the efficiency of gas exchange in air Internal respiratory structures Internal fertilization
"Decreased surface-to-volume ratios to increase the efficiency of gas exchange in air" is not an example of an adaptation for terrestrial living that may have arisen by convergent evolution.
Convergent evolution refers to the process by which different species independently evolve similar traits or adaptations in response to similar environmental pressures.
In the case of the water-to-land transition, some of the adaptations that arose through convergent evolution include eggs with a covering that minimizes water loss, internal respiratory structures, and internal fertilization. These adaptations allowed organisms to survive and reproduce on land without relying on water for these essential functions.
However, decreased surface-to-volume ratios are not an adaptation for terrestrial living.
In fact, increased surface-to-volume ratios are more beneficial for gas exchange in air, as they allow for more efficient diffusion of gases across the respiratory surface. Therefore, this is not an example of an adaptation that arose through convergent evolution during the water-to-land transition.
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HELP PLEASE Which of the following does NOT support the theory of natural selection? *
There are species that live in North America that are not found in Australia
Humans have small bones at the end of our spine that resemble tail bones in other animals
Prehistoric mastodons are similar to today's elephants
Species that are similar to each other tend to live near each other
Answer:
It's A!
Explanation:
The answer is A. There are species that live in North America that are not found in Australia. This observation does not directly relate to the theory of natural selection, which is concerned with how variations within a population can lead to differential survival and reproduction, ultimately resulting in changes in the traits of a population over time. The fact that different species exist in different regions is more related to biogeography and historical factors such as continental drift, rather than natural selection.
On the other hand, options B, C, and D are related to the theory of natural selection. Option B refers to the vestigial tailbones in humans, which suggest a common ancestry with other animals and are an example of a trait that has lost its original function through natural selection. Option C refers to the similarity between prehistoric mastodons and modern elephants, which suggests that elephants have evolved over time through natural selection. Option D refers to the observation that similar species tend to live near each other, which can be explained by the fact that they share similar environmental requirements and have evolved similar adaptations to survive in their respective habitats.
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Honor biology transport problems please help
When the molecules go from a higher concentration to a lower concentration in the presented picture, passive transport is the mode of transport that is being depicted.
What are some instances of active transportation?The accumulation of large concentrations of substances that the cell requires, such as ions, glucose, and amino acids, is typically linked to active transport. The uptake of glucose in human intestines and the uptake of mineral ions into plant root hair cells are two examples of active transport.
What is passive transport and an illustration?There is no energy input required for passive transport. Diffusion, the transfer of molecules from a region of high concentration to one of low concentration, is an illustration of passive transport. Facilitated diffusion involves channel proteins and carrier proteins.
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Faye is an agriscientist who wants to improve breeding practices for the cows on a farm. What is an improvement Faye would MOST likely try to make in these cows?
A.
milder temperament
B.
better quality of milk
C.
higher top speed
D.
longer maximum leg length
A. milder temperament is an improvement Faye would MOST likely try to make in these cows
What does Corteva Agriscience do?From seeds to crop protection chemicals including fungicides, herbicides, insecticides, and seed treatments that protect against weeds, disease, and insects, we offer farmers a wide choice of goods
The precise, natural, economic, and social sciences that are pertinent to the study and practice of agriculture are a part of the vast, multidisciplinary field of biology known as "agriscience."
Agriculture science is largely concerned with the production of plants as a source of food for people.
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How would you expect the rate of meat digestion to differ in an animal whose digestive tract had less of the enzyme pepsin?
Answer:
Because meat is fairly simple to digest, carnivores have very short digestive systems, which results in high stomach acid levels. In contrast, herbivores have extensive digestive systems, which result in delayed digestion and high stomach acid levels.
How do the digestive systems of carnivores, herbivores, and omnivores different? What specific part of their anatomy makes carnivores unable to live off of plants and vice versa?Carnivores have a very short digestive system, because meat is very easy to digest. They have very high acid levels in their stomachs.
Herbivores have very long digestive systems, because plants are very difficult to digest. They have low acid levels in their stomachs, or even a neutral PH. Various species use different methods of extracting nutrition from plants. Some re-ingest their feces, and pass everything through their digestive system twice. Some have fermentation chambers in their intestinal tracts, and use bacteria to break down the plants. (Hindgut and foregut fermentation). Some soften plants, the regurgitate and re-chew them once.
Omnivores tend to have digestive systems that are in between, and ideally suited to neither plants nor animals. They have acidic stomachs, but no always as acidic as carnivores. The length of their lower intestinal tract varies (animals that eat more plants have a longer lower gut).
Carnivores cannot live off of plants because they have such a short lower gut, they cannot ferment the plant matter, or extract many nutrients from it.
Herbivores can extract nutrients from meat, but their bodies are specialized to extract protein from plants, and meat represent an overload. Too much meat, and their organs cannot keep up with the protein overload. Plus, it basically rots inside of them, due to the low acid level. Still, many herbivores eat meat on occasion, often for the calcium in animal bones.
Thank you,
Eddie E.
Which of the following statements is false, with regard to the transport of non-lipid-soluble substances across cell membranes?
A: Both active and passive transport mechanisms exist to move non-lipid-soluble substances across membranes.
B: Diffusion of substances across the cell membrane, from an area of high concentration to an area of low concentration, is considered a passive transport mechanism.
C: Attachment of a non-lipid-soluble molecule to a carrier protein is considered an active transport mechanism. Correct
D: Active transport mechanisms involve energy expenditure on the part of the cell.
e. The sodium-potassium transporter protein is an example of an active transport mechanism.
The false statement with regard to the transport of non-lipid-soluble substances across cell membranes is option C: Attachment of a non-lipid-soluble molecule to a carrier protein is considered an active transport mechanism.
This statement is false because attachment of a non-lipid-soluble molecule to a carrier protein is actually considered a passive transport mechanism. Passive transport does not require energy expenditure on the part of the cell, while active transport does.
The other statements are all true. Both active transport and passive transport mechanisms exist to move non-lipid-soluble substances across membranes (A), diffusion of substances across the cell membrane is considered a passive transport mechanism (B), active transport mechanisms involve energy expenditure on the part of the cell (D), and the sodium-potassium transporter protein is an example of an active transport mechanism (E).
Therefore, statement C is incorrect.
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5
Drag each tile to the correct location,
Determine which physical conditions are necessary to support nuclear fusion and formation of stars.
lower temperature
higher temperature
increased gravitational attraction
decreased gravitational attraction
Promotes Stellar Formation
Does Not Promote Stellar Formation
Reset
Next
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Nuclear fusion is the process by which atomic nuclei combine to form heavier nuclei, releasing large amounts of energy in the process.
This process is what powers stars, including our sun. In order for nuclear fusion to occur and for stars to form, two physical conditions are necessary. The first is a higher temperature. At high temperatures, atomic nuclei have enough energy to overcome their natural repulsion and collide with enough force to fuse together. The second necessary condition is increased gravitational attraction. The force of gravity must be strong enough to pull together the gas and dust in a region of space, causing it to collapse into a dense core that is hot and dense enough to initiate nuclear fusion. Lower temperatures and decreased gravitational attraction do not promote stellar formation, as they do not provide the necessary conditions for nuclear fusion to occur.
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