Answer:
The correct answer is -
The control group: the group of people with no supplements and kept inside.
The dependent variable: Vitamin D level in all groups.
The independent variable: the source of vitamin D (sun or tablets)
Explanation:
The control group of any experiment is the group of subjects that did not receive any type of treatment or did not manipulate by the independent variable. Here the group of 30 people that kept inside and did not get supplements is the control group.
The independent variable is a variable that directly affects the dependent variable by a change in the independent variable. In this experiment, the sunlight and vitamin D tablets are independent variables that affect the vitamin D level in people.
The dependent variable is a variable that is affected by the independent variable or depends on the independent variable, vitamin level is the dependent variable.
Which purpose does a cell membrane play in eukaryotic cells?
The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.
What is a piscivore?
O An animal that eats fish
O An animal that eats plants
O Any fish species
O Any plant species
Plz help I’ll mark brainliest
Answer:
C. The study of the interaction between living and nonliving factors in an environment
Explanation:
Ecology is the study of both living and nonliving things in an environment, the only answer that relates to this in significance is C.
1. Does a scientific theory ever become a law? Explain
the difference between scientific theory and law.
Answer:
a theory cannot become a law
Explanation:
the difference between a scientific theory and a scientific law because a theory is an in depth explanation of an observed phenomenon. a law is a statement about an observed phenomenon or an unifying concept (i.e.: newtons law or gravity - no explanation on how it works or what it is just that it exists.)
Examples of limiting factors
Help me guys!! (Giving brainliest)
Answer: C
Explanation:
C because the cell membrane is semi permeable which means only certain substances can enter and exit.
Think critically A restaurant owner wants to serve fresh-cut fruit. What factors might be considered in choosing a recipe and preparation method
Answer:
Explanation:
1.Oxidation- some fruit after cutting on exposure to air begin to oxidate this leads to a change of color, this color change could range from light brown to dark brown in some fruits such as apple this could make it unappealing to to the consumer.
2. Shelf life- How long can the fruits start after exposure to air before it begins to loose its taste assuming they are not consumed immediately. This have to considered in selecting fruits
3. Time- How long will it take to prepare and make the fruits ready, some fruits requires some thorough cleaning, professional cutting skill
if all will be available and will meet up the time required for the fruits to be served.
All this are some of the factors needed to be considered
. How are mineral deposits formed around vents?
Answer:
When hot, metal-laden water spews from vents and mixes with the cold ocean, the metals precipitate. Large piles of sulfide accumulate on the seafloor and are eventually buried by sediments, modified by heat and pressure in the crust, and uplifted. Some are exposed on land when erosion removes the overlying rocks.
according to the diagram the temperature where clouds form is?
Answer:
higher than the temperature near mountains
Explanation:
Answer: C. lower than the temperature on the ground
Explanation: Because on the chart it shows the temp on the ground is 92° but then the temp where clouds form is 60°. This means that the temp at the ground is higher than the temp at 6000ft.
Which of the three traits considered in this film (bipedality, extensive tool use, and large brains) were present in the 3.2-million-year-old Australopithecus fossil (Lucy)?.
Answer:
The bipedality
Explanation:
One of the things the discovered fossil signified was that human bipedality was more ancient than the large brain size because Lucy actually had a small skull which could indirectly be translated to small brain size.
NOTE: Bipedality can be described to mean the ability of an organism to move about with two legs. Hence, it must have been discovered that Lucy had two legs.
A strategy for fighting bacterial infections uses viruses. Viruses that infect bacteria are called bacteriophages. Phage comes from the Greek word for “eater.” Explain why it is not accurate to call a virus that kills bacteria a “bacteria eater." What happens when a virus attacks a cell?
help!!
Answer:
Viruses are not living organisms, and for that reason a bacteriophage virus does not feed on bacteria, but uses them to replicate, producing lysis of the bacterial cell in the process.
Explanation:
Viruses are structures formed by genetic material —DNA or RNA—covered by a protein envelope called the viral capsid. These structures do not perform the vital functions of a cell, so they are not considered living organisms.
A bacteriophage virus is characterized by using prokaryotic cells to replicate, destroying them in the process.
Viruses need a living cell to be able to replicate, so they introduce their viral genome into them to replace the genetic material of their nucleus and be able to multiply. They can do this:
Introducing the genetic material from outside the cell. Entering directly into the cell to be able to replicate.Bacteriophage viruses do not eat the bacteria, they simply use it to reproduce, and then happens the lysis of the bacterial cell.
Answer:
Viruses are not living organisms, and for that reason a bacteriophage virus does not feed on bacteria, but uses them to replicate, producing lysis of the bacterial cell in the process.
Explanation:
Two different groups of scientists studying a rare trait in ground squirrels report very different heritabilities. What factors influencing heritability values make it possible for both conclusions to be correct?
Answer:
It is a trait highly influenced by environmental factors (i.e., it has low heritability)
Explanation:
In population genetics, heritability is a statistical measure to estimate the proportion of the phenotype variation of a given trait which can be explained by hereditable genetic factors. The heritability of a trait is influenced by environmental factors, genetic factors (e.g., allele frequencies, number of genes involved in trait variation, recombination rate, etc), and the interaction between genetic and environmental factors. A low heritability value suggests that most of the variation is not genetic (i.e., due to environmental factors), while a high heritability value suggests that almost all of the variability in a trait is due to genetic factors.
a. What is the major evolutionary advantage to producing an amnion?
b. What does that mean for embryonic development for the animal phylum as compared to the animal phyla?
WHAT IS THE MAJOR EVOLUTIONARY ADVANTAGE TO PRODUCING AN AMNION?
The main evolutionary advantage of producing an amnion is that the embryos of the amniotic membrane,the amniotes are made available with their own aquatic environment,this in-turn resulted to a lesser dependence on water for it's maturation and development therefore allowing or giving room for the amniotes to branch towards environments that are drier.
WHAT FOES THAT MEAN GOR EMBRYONIC DEVELOPMENT OF THE ANIMAL PHYLUM AS COMPARED TO THE ANIMAL PHYLA?
The embryonic development of animal phylum is also known as embryogenesis.
It is the development of the embryo from the point of fertilization of an egg,(the ovum) by a sperm cell ,this makes the fertilized egg a diploid cell otherwise known as a zygote.
This zygote undergoes mitosis,a mitotic division known as cleavage and a differentiation resulting in a multicellular embryo.
This embryonic development of animal phylum comprises of 36 animal phyla.
If the scientific name of the tiger is Panthera tigris then: to what genus do tigers belong?
particles is found in the nucleus of an atom
Answer:
protons and neutrons
Explanation:
Protons and neutrons have a positive and neutral charge, respectively. They are in the nucleus, while the negative electrons orbit the nucleus.
Answer:
Protons, neutrons, electrons
Explanation:
If you're asking about subatomic particles.
Let's suppose you were interested in developing drugs to prevent epigenetic changes that may contribute to cancer. What cellular proteins would be the target of your drugs?
Answer:
Potential targets:
1- DNA methyltransferases
2- Chromatin modifiers such as histone acetyltransferases, histone deacetylases, histone methyltransferases, etc.
3- Components of the RNA interference (RNAi) machinery such as Dicer, Argonaute, etc.
Explanation:
Epigenetics can be defined as the study of any heritable change in the phenotype that does not involve modifications in the DNA sequence. Epigenetic mechanisms can be classified into three major types: 1-DNA methylation, 2-histone modifications (e.g., acetylation, methylation, phosphorylation, etc), and 3-regulatory non-coding RNAs (e.g., miRNAs, lncRNAs, siRNAs, etc) that modulate target gene expression via the RNA interference pathway. There are different types of proteins that are involved in these complex epigenetic mechanisms, and those cited above represent only some examples that can be used as therapeutic targets.
A plant that was grown in the dark continuously would: ________.
a. not be able to take in CO2 without sunlight.
b. remain healthy because plants have stored materials in their roots that can provide what the Calvin cycle needs.
c. not be able to split water to provide NADH.
d. continue to photosynthesize because to in carbon dioxide, the only outside input to the Calvin cycle, does not require sunlight.
Answer:
c. not be able to split water to provide NADH.
Explanation:
Photosynthesis, which is the process by which plant species obtain their energy, occurs in two stages viz: light dependent phase and light independent phase. The light dependent phase of photosynthesis requires the energy from sunlight, which is captured by the chlorophyll pigments in the leaves of the plant.
The light energy captured by the chlorophyll is used to split water molecule in a process called PHOTOLYSIS OF WATER. Overall, ATP and NADH (electron donor) are products of the light dependent stage, which enters the next stage to complete the photosynthetic process.
Therefore, a plant that was grown in the dark i.e. no access to light, continuously would not be able to capture light energy and hence not be able to split water to provide NADH.
A plant that was grown in the dark spontaneously would not possess the tendency to split water to provide NADH.
What is photolysis of water?The process by which the species of plant attain their energy, that is, photosynthesis, takes place in two stages:
Light independent phaseLight dependent phaseIn the light dependent phase, energy is needed from sunlight, and is captivated by the chlorophyll pigments present in the leaves of the plant. This energy from the light is used to split the molecule of water by a process known as photolysis of water.
The products of the light dependent stage is ATP and NADH that enters the next phase to complete the process of photosynthesis. Therefore, a plant, which was grown in the dark, that is, having no accessibility to light, would not possess the tendency to captivate the energy from the sunlight and thus would fail to split the molecule of water to provide NADH.
Thus, the correct answer is option c.
Find out more information about the photolysis of water here:
https://brainly.com/question/13984369
Which of the following statements regarding the human
population are TRUE? Select TWO.(Remember, there is no
partial credit)
SELECT ALL THAT APPLY
The world's population of humans is
increasing.
In every country, the human population is
increasing.
In some countries, the human population is
decreasing or staying the same.
The world's population of humans is
staying constant
Answer:
The world's population of humans is
increasing.
and
In every country, the human population is
increasing.
Determine the identity of an atom
Answer:
The number of protons in one atom of an element determines the atoms identity.
The alpha tubulin side of a microtubule is the site of microtubule:
A. growth
OB. dissociation
OC. movement
D.adaptation
Answer: Movement
Explanation:
Tubulins are the building block of microtubule,there are five distinct forms: alpha, beta, gamma, delta, and epsilon tubulin, they exist as globular dimeric .
Alpha and beta tubulins assemble into heterodimers they come together to form the long microtubule filaments. Some organism cellular movements require microtubules this include the beating of cilia and flagella for movement, cytoplasmic transport of membrane vesicles.
The alpha tubulin side of a microtubule is the site of microtubule movement.
(option c)
TubulinsTubulins are the microtubule building block and they exist as globular dimeric proteins of alpha/beta chains. There are five different forms: alpha, beta, gamma, delta, and epsilon tubulin.3
Alpha Tubulin is a fundamental cytoskeleton protein with many roled
Tubulin-binding drugs kill cancerous cells by inhibiting microtubule dynamics, which are required for DNA segregation and therefore cell division.
Learn more about tubulins:
https://brainly.com/question/12884177
5. Explain how interactions and trade with Europeans affected West Africa?
European Exploration Study Guide
Why did European countries compete for power in North America?
Economic—Gold, natural resources, and trade
Religious—Spread Christianity
Competitions for empire and belief in superiority of own culture
What were the obstacles faced by the explorers?
Poor maps and navigational tools
Disease and starvation
Fear of the unknown
Lack of adequate supplies
What were the accomplishments of the explorations?
Exchanged goods and ideas
Improved navigational tools and ships
Claimed territories
What regions of North America were explored and settled by France, England, and Spain?
Spain: Francisco Coronado claimed the Southwest of the present-day United States for Spain.
France: Samuel de Champlain established the French settlement of Québec. Robert La Salle claimed the Mississippi River Valley for France.
England: John Cabot explored eastern Canada.
What regions were explored by Portugal?
The Portuguese made voyages of discovery along the coast of West Africa.
How did the American Indians and Europeans interact with each other?
Spanish
Conquered and enslaved American Indians
Brought Christianity to the New World
Brought European diseases to American Indians
French
Established trading posts
Spread Christian religion
English
Established settlements and claimed ownership of land
Learned farming techniques from American Indians
Traded with American Indians
American Indians
Taught farming techniques to European settlers
Believed that land was to be used and shared but not owned
Homeostasis: Response to Stimuli
From the examples below, select the examples of cells or organisms responding to stimuli in order to maintain homeostasis.
1.)A plant bending toward a light source
2.)A cell bursting because it takes up too much water
3.)A person shivering when their body temperature is low
4.)A unicellular organism beating microscopic hairs to escape a chemical pollutant in its environment
5.)A cell dying due to a chemical poison
6.)An animal growing larger
7.)Ants moving within their mounds depending upon the time of day
8.)Iguanas laying in the sunlight if their body temperature is low
9.)Birds migrating when seasons change
10.)A person or animal getting sick because of infectious bacteria
part2 fill in the blank
A state of biological balance, or ____________ , is important for the survival of individual cells and ____________ alike.
Physiological factors such as ____________ , water levels, and pH must remain within a certain ____________ for cells and organisms to remain healthy and functional.
Regulation of the ____________ environment of cells and organisms is carried out through ____________ and other control ____________ .
choice of words:
location
external
hormones
mechanism
homeostasis
internal
groups
feedback
oganisms
temperature
range
Answer:
3.)A person shivering when their body temperature is low.
7.)Ants moving within their mounds depending upon the time of day
1-A plant bending toward a light source.
.-Iguanas laying in the sunlight if their body temperature is low.
.-A unicellular organism beating microscopic hairs to escape a chemical pollutant in its environment
.-Birds migrating when seasons change.
The maintenance of relatively constant internal environment of an organism is called Homeostasis.It is an automatic regulations of the body systems and organs controlled by the brain and some receptors, specific for certain body fluctuations.E.g Thermoreceptors Chemoreceptors etc.
The fluctuations in the body internal systems must be controlled within a narrow limits, for existence of living organism.The brain receives inputs from the receptors, and the outputs from the brain ensures the homeostatic control.
The above examples are typical homeostatic responses by the organisms involved, because the inputs from the receptors send signals to the brain ,and the organisms responded to these with the example above.
Explanation:
A peptide has the sequence of Gly-Ser-Glu-Leu-Ala-His-Gly-Arg-Leu-Ala-PheCys-Leu. (pKR=4.25, 6.0, 8.2, 12.5. Assume pKa’s of amino terminus and carboxyl terminus are 9.6 and 2.3, respectively.) The PI of the peptide is close to:_______
a. 7.1
b. 7.8
c. 5.1
d. 8.2
e. 10.3
Answer:
The correct answer is option a. "7.1".
Explanation:
One easy way to determine if a peptide sequence is acidic, basic or neutral is to check for the number of amino acid residues that are acidic, basic or neutral. In this case, most amino acid residues are neutral, which mean that under neutral conditions they have a pKa close to 7.0. Particularly, the content of 3 leucine, 2 alanine and 2 glycine residues determines that the peptide have a pI of around 7.1.
Which type of rock does B represent?
Group of answer choices
help me please !!!!!!
we find ATP
like glucose and other organic compounds
Forests dominated by gymnosperms tend to have mechanisms to allow it to regenerate after a fire. As a consequence this type of forest ______________.
a. dominate areas where the U.S Forest Service does not put out fires.
b. only lives 20-30 years
c. is dominated by trees of a single age
d. has no overstory species
Answer:
Forests dominated by gymnosperms tend to have mechanisms to allow it to regenerate after a fire. As a consequence this type of forest is dominated by trees of single age .
Explanation:
It is possible to conclude the question given above in many ways. After a forest fire in a specific forest patch occurs, the impacts are determined by the severity of the fire and the type of forest in which the occurrence occurs. Usually, the dramatic effect on the trees and plants that can be seen in that region can be seen after such an occurrence has occurred. In certain situations, the situation can also worsen, leading to the destruction of the entire cover, if the circumstances favor the propagation of fires. In such cases, the removal of the prevailing structure can lead to the formation of a new forest structure through a mechanism called 'succession,' in which there is a sequence of progression in a biologically acceptable manner through the growth of different plant species. Simply put, the new plants will attempt to adapt or acclimatize to the conditions introduced after forest fire in such a way that this will later provide the route for the growth of plants and trees that can not easily accommodate in the harsh conditions. Therefore, instead of the forest surviving for a short period of time following a forest fire occurrence, there would be changes in the nature of the forest. This suggests that option 'B' is not the response that is most suitable.Choice 'A' appears to be logically inaccurate, taking into account that if they are of high intensity, fires may be uncontrollable. In addition, there is no clear mention of the fire's region of origin and which trees are most affected. Typically, gymnosperms illustrate a simple process in which they can not limit their destruction from the flames, while they can provide a way for their progeny to initiate next generation development in the form of seed. This occurs in the case of Gymnosperms in which, under ordinary conditions, the seeds of the plants are enclosed within a cone that is restricted from germinating. Although the fires pave the way for the seeds to germinate under certain fire conditions, which in turn leads to the emergence of the next generation of gymnosperms, and several studies indicate that these newly introduced seeds would have the same age as choice 'C' indicated. But, as this is not under the jurisdiction of the US Forest Service, legally, option 'A' tends to be wrong. At the same time, it can be seen that forest fires are not consistent in their coverage in certain cases, and thus the chances of dispersal and germination tend to be not even and thus choice 'C' can be reported to be either correct or incorrect in all possible ways.But, first, it is important to know what an overstory is for the option 'D'. A forest consists of trees of all sizes, from the smallest to the tallest pine trees. The uppermost element that is directly in contact with the light from the sun is the overstory. The manner in which the degree of overstory damage occurs depends on the moisture content of the trees and the other associated conditions around the trees. Taking this into account, a forest fire may either lead to the loss of an entire overstory or can have impacts that are confined to plants and trees at the ground level. So, even the 'D' option can be right or inappropriate. But, therefore, choice 'C' should be the most suitable response, taking into account that most studies indicate growth of single-age trees due to germination mediated in the presence of fire. This seems to be scientifically right for a small patch where there was also fire-mediated damage. Accordingly, the most suitable response should be option 'C'.Hence , the correct option is C.
SOMEONE PLEASE HELP MEEEE you don’t have to explain just tell me if it’s true or false
Answer:
7. True
8. False
9. True
10. True
Explanation:
True or false consumption efficiency in Huckleberry patches is high like in a forest ecosystem
Answer:
True
Explanation:
Describe the relationship between the weight added and the force of gravity.
Answer:
D
Explanation:
The heavier somthing is than the gravatational pull is more heavy
What is the role of DNA polymerase in DNA replication?
A. It ties the chunks of DNA together.
B. It creates the replication fork.
C. It checks the DNA for errors.
D. It breaks apart the bases.
Answer: it checks the DNA for errors
Explanation:
Just took test
Answer:
A. ties chunks of dna together, took the test
Explanation: