Over 400 years ago, the bark of the cinchona tree was discovered to contain a chemical compound called quinine. Quinine was, and still is, used to cure and prevent malaria. This is an early example of ____________________.
a. biotechnology
b. scientific modeling
c. genetic engineering
d. genomics
Answer:
A.
Explanation:
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ALL MATTER HAS THE SAME PROPERTIES.
A. True
B. False
Answer:
false
Explanation:
some don't
Answer:
FALSE
gases and solids and liquids all have very different properties, thats not even mentioning plasma and BEC
Explanation:
thanks for the opportnity sir
Summarize the path of an oxygen molecule from the nose to the bloodstream the
Answer:
The oxygen molecule passes through the wall of the alveoli and enters inside tiny blood vessels called capillaries where exchange occurs. A protein called hemoglobin in the red blood cells then carries the oxygen around your body.
Explanation:
Explain how organisms in both of the ecosystems are dependent on their environmental interactions with other living things and with nonliving factors.
Answer:
Explanation:Organisms, and populations of organisms, are dependent on their environmental interactions both with other living things and with nonliving factors. ... Mutually beneficial interactions, in contrast, may become so interdependent that each organism requires the other for survival.
The organism that considered for an ecosystem that should be dependent on the environmental interactions should be explained below,
Environmental interactions:The organism and the organism population should be based on the environmental interactions along with the other living things also even with the non-living things of factors.
On the other hand, Mutually beneficial interactions should be considered as the independent where each and every organism should needed other for the survival purpose.
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clearing of these has a harsh effect on animal population. What is it called?
Provide two reasons why it is important to isolate undigested plant cells.
I need this asap
Answer:
It helps to support growth and helps producing energy to do vital functions.
Hope this helps!
A reliable DNA analysis is based on the DNA conditions. The importance of using undigested cells is that DNA is well-preserved, not affected by external factors, and can be used to compare it to database sequences.
------------------------------------------
Dr. Pringle studies niche partitioning and competition reduction among coexistent species in Africa.
He is interested in knowing the exact source of food of different herbivorous species. To do so, he is using the technique of DNA metabarcoding.
He collects fresh animals' dung and gets the indigested plant cells.
DNA is isolated, sequenced, and compared with the DNI of known species, which are a potential source of food for these animals.
Once he matches the cells' DNA with the corresponding plant species from the database, he can use this information to detail the animal's source of food.
The importance of getting fresh, undigested cells from the dung, is that
The animal's digestive enzymes have not broken the cell walls and digested the cell content. The dung environmental conditions such as pH, temperature, or microbiota have not affected the cell's DNA. Undigested cells' DNA is well-preserved and can be used to compare it with the plant species database.------------------------------------------------------
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3) identify and describe three abiotic characteristics of ecosystems. Give an example of how each
characteristic could be affected by a human activity
Answer:
The abiotic characteristics of an ecosystem that affects man includes: Land surface, rainfall and relative humidity.
Explanation:
In the ecosystem, man occupies the terrestrial habitat which is affected by the abiotic factors listed above.
Abiotic (non- living) factors determine the type of biotic (living) community that is found in an ecosystem. These factors include Land surface, rainfall and relative humidity, just to mention a few.
--> LAND SURFACE: This is responsible for the marked variation in the vegetation of a place. For example, a mountain in the tropics may have a rain forest vegetation at it's base and an afroalpine vegetation near its peak. The gradient of the slope affects the growth of organisms. A steep slope encourage fast run - off of water and therefore encourages erosion, which results in shallow and infertile soil. This in turn AFFECT man's farming activities as there would be little to no crop yield.
--> RAINFALL: Water is a very important abiotic factor that affects life. The main source of water to terrestrial habitat is rainfall. When rain falls, a greater percentage of it sinks into the soil while the rest run- off into water bodies. Water is absorbed by root hairs into the plant and used for photosynthesis to produce food. The absence of rainfall in the environment of man could lead to drought which AFFECTS man negatively.
--> RELATIVE HUMIDITY: This is a measure of the amount of moisture in the atmosphere. It's usually high in hot wet regions. It affects the rate at which water evaporates from the body surfaces of organisms. Low relative humidity cause more water (sweat) to evaporate from body surfaces giving the human body a cooling effect. But in high relative humidity, the sweat cannot evaporate leaving the body feeling hot and sticky. This AFFECTS man as the body tries to cool off in a harder way by increasing rate of respiration and depth of blood circulation.
You leave a cracker in your mouth for 7 minutes without chewing. Hormones signal amylase to be released in your mouth and the cracker begins to dissolve. Which to systems ane being used in this scenario?
A.Endocrine & Immune
B.Digestive and Skeletal
C.Endocrine & Digestive
D.Digestive and Excretory
estimate how many calories a
person burns from physical activity.
Answer:
For men: 66 + (6.2 x weight) + (12.7 x height) – (6.76 x age)
For women: 655.1 + (4.35 x weight) + (4.7 x height) – (4.7 x age)
Explanation:
distinguish between active and passive immunity
Answer:While active immunity occurs when an individual produces antibodies to a disease through his or her own immune system, passive immunity is provided when a person is given antibodies.
Explanation:
Neuromodulation is the release of chemicals (other than ____________ ) from cells that locally regulate or alter the response of neurons to neurotransmitters. The substances released are called ____________ . Neuromodulation generally results in either facilitation or inhibition. When there is greater response from a postsynaptic neuron because of the release of neuromodulators it is ____________ . This may result from either ____________ amount of neurotransmitter in the synaptic cleft or ____________ number of receptors on postsynaptic neurons. When there is less response from a postsynaptic neuron because of the release of neuromodulators, it is called ____________ . This results from either ____________ amount of neurotransmitter in the synaptic cleft or ____________ number of receptors on postsynaptic neurons.
Answer:
Neurotransmitters; neuromodulators; facilitation; an increased; an increased; inhibition; a decreased; a decreased.
Explanation:
In Biology, stimulus can be defined as an obvious change in either the chemical or physical structure of an organism' environment (either external or internal). Thus, all living organisms (both animals and plants) respond to changes in their environment and consequently, an appropriate response or reaction is made. Also, stimulus arising from within the organism is known as internal stimulus while those from its environment are known as the external stimulus.
In organisms, the specialized cells that detect stimulus are generally known as sensory receptors while a group of these receptors is referred to as sense organ.
Neuromodulation is the release of chemicals (other than neurotransmitters ) from cells that locally regulate or alter the response of neurons to neurotransmitters. The substances released are called neuromodulators. Neuromodulation generally results in either facilitation or inhibition. When there is greater response from a postsynaptic neuron because of the release of neuromodulators it is facilitation. This may result from either an increased amount of neurotransmitter in the synaptic cleft or an increased number of receptors on postsynaptic neurons. When there is less response from a postsynaptic neuron because of the release of neuromodulators, it is called inhibition. This results from either a decreased amount of neurotransmitter in the synaptic cleft or a decreased number of receptors on postsynaptic neurons.
The image represents the mitosis process and it is important because:
A. produces gametes with half genetic information than parent cell.
B. allows processes as growing and repair tissues in the body.
C. does not produce cells with the same genetic information than parent cell.
D. always produce somatic cells with the same characteristics, it does not matter the organ in the body.
Answer:
B. allows processes as growing and repair tissues in the body.
Explanation:
Mitosis is a process where a single cell divides into two identical daughter cells. During mitosis one cell divides once to form two identical cells and the dividing cell's chromosomes are copied and then distributed equally between the two new nuclei of the daughter cells.
The major purpose of mitosis is for growth and to replace worn out cells. It also plays an important part in the development of embryos.
Mitosis is divided into five stages:
1. Interphase- during interphase, the DNA in the cell is copied resulting in two identical sets of chromosomes. Microtubules also extend from the centrosomes outside the nucleus
2. Prophase- during this phase, the sister chromatids in each chromosome pair up, the nuclear membrane dissolves and the mitotic spindle consisting of microtubules and other proteins extend across the cell between the centrioles which move to opposite ends of the cell.
3. Metaphase- the chromosomes line up at the centre of the cell and the mitotix spindle attaches to eachmof the sister c hromatids.
4. Anaphase- the sister chtomatids are pulled apart to each end of the cell by the mitotic spindle.
5. Telophase- at each pole, a full set of chromosomes gather together, a membrane encloses each chromosome, the cell pinches at the middle and then divides into two. This is known as cytokinesis.
Which of the following statements is true about niches?
I. New species can outcompete native species to fill a niche.
II. Extinction or emigration of a species can leave a niche vacant.
III. Some species occupy niches that no other species can fill.
Answer:
0
Explanation:
Explain in a paragraph how speed and velocity impact blood splatter
Please no links!
Answer:
The force of the blood hitting a surface for medium velocity blood spatter is between 5 and 100 feet per second. This causes the droplets of blood to be smaller in diameter, and more like a spray. High velocity blood spatter: ... This causes the pattern of the blood to be similar to a fine spray.
Explanation:
Which best describes how to classify water?
A It is an element because it is made
from a pure substance.
В
It is a compound because it is made
of a single kind of molecule.
© It is a mixture because it is composed
of more than one molecule.
D It is a solution because it is a
homogenous mixture of different
compounds.
Answer:
D
Explanation:
Water is a compound and scientifically known as H[tex]_{2}[/tex]0 (2 hydrogen atoms and 1 oxygen). Therefore, the answer is...
Not A because water is not an element of one pure substance; rather, it is a compound and can be broken down into two pure substances.Not B because the statement contradicts itself: a compound is made of different atoms and, thus, different molecules.Not C because a mixture contains different substances that are physically -- not chemically -- combined. And as we know, water is a compound, which means that its atoms are chemically bonded to one another. Or else it would just be 2 free hydrogen atoms and 1 oxygen.D (yay!) because it is not the *most* accurate, but simply the best description of those provided. Water can be described as a homogenous (uniform in appearance) mixture because, minus the "mixture" part, that's what it is, essentially: a substance that looks pure but is really made of up different molecules.Ngl this was tricky, but I hope this helps :)
A complex multicellular organism has different levels of organization. What is the order of the levels from least complex to most complex?
1organ system, organ, tissue, cell
2cell, tissue, organ, organ system
3cell, organ system, organ, tissue
4organ, tissue, cell, organ system
Answer:
A. tissue, cell, organ, organ system, organism
Explanation:
The order of the levels from least complex to most complex are 3cell, organ system, organ, tissue.
What is complex multicellular?The term multicellular organism is known to be a type of an organism that is made up of multiple cell.
These organisms are known to be complex due to the fact that they have different kinds of differentiated cells such as 3cell, organ system, organ, tissue.
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Which of the following contribute to dirty air?
Select three options.
• photosynthesis
• fossil fuels
• smoking
• mold
• respiration
Answer:
Fossil Fuels, smoking, mold
Explanation:
Answer: Fossil Fuels, smoking, mold
Explanation: On Edge!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Cardiac output is the amount of blood pumped by the heart in one minute. Which of these will increase cardiac output?
Answer: the factors that increase cardiac output include:
--> Nervous stimulation and
--> Hypertrophy of the heart.
Explanation:
Cardiac output can be defined as the quantity of blood pumped into the aorta each minute by the heart. This is also the quantity of blood that flows through the circulation. There are factors that can cause increased cardiac output or that can lead to a hypereffective heart. They are:
--> NERVOUS STIMULATION: The combination of sympathetic stimulation and parasympathetic inhibition does two things to increase the pumping effectiveness or cardiac output of the heart. These include:
• it greatly increase the heart rate from the normal level of 72 beats/mum up to 180 to 200 beats /mom.
• it increases the strength of heart contraction, which is called increased contractility to twice it's normal strength.
--> HYPERTROPHY OF THE HEART: A long term increased workload, but not so much excess load that it damages the heart, causes the heart muscle to increase in mass and contractile strength in the same way that heavy exercise causes skeletal muscles to hypertrophy. This effect of increased muscle mass of the heart, allows the heart to pump much greater than usual amounts of cardiac output.
How many sugar phospha te backbones are in one strand of DNA?
Answer: Two
Explanation: In double-stranded DNA, the molecular double-helix shape is formed by two linear sugar-phosphate backbones that run opposite each other and twist together in a helical shape. The sugar-phosphate backbone is negatively charged and hydrophilic, which allows the DNA backbone to form bonds with water.
DNA double helix. Hydrogen bonds break and helix opens. Each strand of DNA acts as a template for synthesis of a new, complementary strand. Replication produces two identical DNA double helices, each with one new and one old strand.
Answer:
The process described above is known as DNA replication.
Hope this helps you! Have an amazing day!
state the taxonomic family to which the virus that causes EVD belongs
Ebolavirus, genus of viruses in the family Filoviridae, certain members of which are particularly fatal in humans and nonhuman primates. In humans, ebolaviruses are responsible for Ebola virus disease (EVD), an illness characterized primarily by fever, rash, vomiting, diarrhea, and hemorrhaging.
Inside a human stomach, hydrochloric acid is important in digestion. Which reason best explains why the enzymes found in other parts
of the body would not function well in the stomach?
a. The temperature is too high
b. There is not enough water
C. The pH is too acidic
d. There are not enough substrates
Answer:
C. The pH is too acidic
Explanation:
Many acids and bases in living things are secreted to provide the proper pH for enzymes to work properly. Enzymes are biological catalysts, such as pepsin, which is needed to digest protein in the stomach and requires an acidic environment.
What are three of the products whales are hunted for by the whalers and their substitute products?
Which of the following BEST describes the primary goal for meiosis:
Answer:
D) Daughter cells are produced with only half the chromosomes of the parent cell.
Explanation:
The primary goal of meiosis is to create four gametes, which are cells with only half the chromosomes of the parent cell
What option would be a good adaptation for an animal in a dense RAINFOREST? *
A. heavy body
B. ability to sprint
C. ability to blend with multiple colors and patterns
Answer:
c because they need to live instead of dying. bc from other bigger animals they can see it and eventually die so.
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Which of the following is the broadest taxonomic category?
A
phylum
B
class
C
genus
D
domain
Answer:
I think it's A- phylum, hope this helps
Pls help me and thank youuuu
Compare cladistics with Linnaeus's classification
The real length of one villus is 0.8 mm
Calculate the image length if the villus is viewed at a magnification of x20
magnification = size of image / size of real object
Answer:
Explanation:
Re arrange formula=Size of image=Magnification*size of real image
0.8mm*20=16mm
The image length will be "16 mm". A further explanation is below.
Given:
Magnification,
20Size of real image,
0.8 mmAs we know the formula,
→ [tex]Magnification = \frac{Size \ of \ image}{Size \ of \ real \ image}[/tex]
or,
→ [tex]Size \ of \ image=Magnification\times Size \ of \ real\ image[/tex]
By substituting the values, we get
→ [tex]=20\times 0.88[/tex]
→ [tex]= 16 \ mm[/tex]
Thus the response above is correct.
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Match the following terms with the correct definition. Arterioles Arteries Capillaries Venules Veins Small vessels that carry blood away from the heart to the capillaries are __________. Muscular-walled vessels that carry blood away from the heart are _______. One-cell-thick microscopic vessels that function to exchange nutrients and wastes are _________. Small vessels that connect to the capillaries that carry blood back to the heart are ________. Vessels that carry blood back to the heart are _________.
Answer:
Small vessels that carry blood away from the heart to the capillaries are Arterioles. Muscular-walled vessels that carry blood away from the heart are Arteries. One-cell-thick microscopic vessels that function to exchange nutrients and wastes are Capillaries. Small vessels that connect to the capillaries that carry blood back to the heart are Venules. Vessels that carry blood back to the heart are Veins.
Explanation:
We have different types of vessels in our bodies. We can divide them by their size and structure. Starting from the ones that carry blood away from the heath, we have the arteries. Arteries are vessels of big diameter that have muscle around them. Then, the arteries branch into arterioles, which have a smaller diameter. The arterioles branch into capillaries. These are small vessels with thin walls that allow the exchange of nutrients, wastes, and gases with the neighboring tissues. Once that the blood flows through the capillaries, it goes to the venules, which are small veins that will carry the blood to the veins and these to the heart. The veins do not have muscles in their structures, and their walls are thinner than the ones in the arteries.