Answer:
due to the structural-binding properties of the nitrogen bases
Explanation:
Adenine and guanine are purines (two-carbon nitrogen ring bases) that pair with thymine and cytosine pyrimidine nitrogen bases (one-carbon nitrogen ring bases), respectively. These specific base-pair rules are due to their hydrogen bonds (i.e., van der Waals forces), which stabilize the structure of the DNA helix. Cytosine and guanine have three sites to form hydrogen bonds to each other, while adenine and thymine have only two sites. The specific interactions between purines and pyrimidines are critical for proper bonding and attachment to the sugar-phosphate DNA backbone (i.e., for the formation of the DNA double-helical arrangement).
Which of the following statements best describes negative feedback loops?
A. They respond to changes with changes in the same direction, to move a value toward an endpoint.
B. They produce negative outcomes for the organism.
C. They aren't used often in maintaining homeostasis.
D. They respond to changes with changes in the opposite direction, to keep a value in the optimal range.
Answer:
B but if I'm wrong I'm so sorry I'm really tired but I think I'm right
Explanation:
An example of a succulent is a _
Answer:
Agavoideae
Explanation:
Which of the following describes how regions of phospholipids are arranged in the cell membrane?
Answer:
phospholipds are arranged in the phospholipid bilayer, inside the plasma membrane.
Explanation:
they have one hydrophilic head and two hydrophobic tails.
Phospholipids are amphipathic molecules that compose the cell bilayer membrane. Among the options, D is correct. Hydrophobic fatty acid regions face each other within the interior of the cell membrane.
-----------------------------------------------------
Two lipidic layers compose the cell membrane. There are also proteins and glucans incrusted in between.
The complex lipids that compose the membrane are amphipathic molecules. A phospholipid is composed of
two fatty acid chains ⇒ hydrophobic tails, glycerol and a phosphate group ⇒ hydrophilic heads negatively charged
Phospholipids are arranged as a bilayer. Their hydrophilic polar heads face the exterior and the interior of the cells, while their hydrophobic tails are hidden against each other, constituting the internal part of the membrane.
According to this framework, we can choose the best answer among the options,
A) Hydrophilic phosphate regions face each other within the interior of the cell membrane ⇒ Incorrect ⇒ Heads are not facing each other. They are in contact with the cell exterior and interior.
B) Hydrophilic phosphate regions are positioned toward nonpolar environments ⇒ Incorrect ⇒ Phosphate regions are in contact with water.
C) Hydrophobic fatty acid regions are positioned toward polar environments ⇒ Incorrect ⇒ tails can not be in contact with water.
D) Hydrophobic fatty acid regions face each other within the interior of the cell membrane ⇒ CORRECT.
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Related link: https://brainly.com/question/6321518?referrer=searchResults
I have a question regarding construction building code ? can you help?
Which step in the digestive process represents a chemical change in food?
Answer:
digestion
Explanation:
What is the relationship between snails and Elodia
Answer:
The relationship between snails and elodea is symbiotic in that the snail eats algae and produces carbon dioxide. The elodea takes in the carbon dioxide and, through photosynthesis, creates oxygen, which the snail and every living thing in the tank uses to breathe.
Explanation:
hope it helps you!!
n.kjbhykvgtcf vbhijbhjjbhiygihkjbm
When looking across the periodic table from left to right, which of these groups are the first to contain nonmetals?
Answer:
3 A the 13 group boron is the nonmetal in it and in 14 group carbon is the nonmetal
Explanation:
will mark brainiest and look at the points
Mutations can be either spontaneous (no known cause) or induced (caused by specific environmental agents). What are some environmental agents that could increase the rates of genetic mutations among humans today? What types of mutations have the potential to be the most significant from an evolutionary perspective?
Answer:
Explanation:
Mutations happen spontaneously. The rate of mutation can be increased by environmental factors such as UV radiation , X-rays, gamma rays and certain types of chemicals such as bromine. These are some factor that can increase the rate of mutation
The classic example of evolutionary change in humans is the hemoglobin mutation named HbS that makes red blood cells take on a curved, sickle-like shape. With one copy, it confers resistance to malaria, but with two copies, it causes the illness of sickle-cell anemia. Examples of beneficial mutations include HIV resistance, lactose tolerance, and trichromatic vision.
Explanation:
Look the Mutations happen spontaneosly.So this means that this can increased by the enviromental factors such as Uv radiation, The X-rays, The Gamma Rays, and for last one the certain types of chemicals such as a bromine.These are some factors that increase the rate of the mutation.
So and here is the answer that you was looking for your answer was What are some environmental agents that could increase the rates of genetic mutations among humans today? well im here for teach you and told you or explain you whatever you wanted to call ir im here for teach you The evolutionary change that are in humans is that thing how is called? yes the Hemogoblin and you will say what is that thing why i want to know what is Hemogoblin Well you have to know that that think the hemogoblin is a mutation names "HBS" that makes the red blood cells it's for that reason that is important the "HBS" but there is the bad thing about the hemogoblin it makes the Anemia that is one of the terrible things that can happen to you ok?. Look they are good and bad thing about the Hemogoblin Im going to leave you some good and bad things about the hemogoblin: (But there are things that you have to know first the normal hemogoblin is in your DNA and in your DNA it's called G A G and it has too the C T C in your RNA it's called G A G and finally it nakes the GLU The GLU it's the normal Protein, but the hemogoblin can mutate the cell can get sick and the letters that are like This G A G those are going to change:
C T C They going to change like this:
(mutated)--- -- G T G
C A T (The RNA alsi change) G U G
|
|
\/
Val
(Original No mutated)---- G A G
C T C
G A G
|
|
\/
(GLU)
The GLU is the Original Protein but the Val is the mutated Protein.
Now im going to say good and Bad thing about the Hemogoblin.
Good Things
N1:It creates the Blood cells
N2:Lactose Tolerance
N3-and also the Hemogoblin includes the HIV that is a resistance
Bad things about the Hemogoblin
N1-One of the most bad things of the hemogoblin is the Anemia that is the worst things as i say that can happen to you
and that's all you have to know
PD: I hope you give brainlest i make a whole investigation of that i have to make a hypothesis and everything and im so tired i have been here like 1 hour with 45 minutes.
HELP HELP HELP ASAP ILL GIVE 100 points
Answer:
What's the question you need help with?? I will try my best to help. I'm not taking free points btw. I'm just wondering on what your question is
2
If an organism has 15 chromosomes in a single sperm cell, how many
chromosomes would reside in its somatic cells?
O 15
O 30
0 7.5
45
Answer:
i just think but not sure
the answer is 30.....
I think but not sure
clarify and tell whether I am correct or not
Planet X is a terrestrial planet in our solar system. It has 21% oxygen in its atmosphere. Humans can walk on this planet without the aid of a space suit. Based on the description, planet X is____ .
a.Earth
b.Mars.
c.Mercury
d.Venus
Answer: the answer is actually earth
Explanation: A
With parallel flow, diffusion of urea happened at regions I and II but not at regions III, IV, or V because...
A
Urea was too big to fit through the pores in regions III, IV, or V.
B
There was no concentration gradient for urea in regions III, IV, or V.
С
There was no urea in the blood in regions III, IV, and V.
D
The pore size was too small in regions III, IV, and V.
Answer:B
Explanation:bc all of the other ones was equal together and the concentration gradient could not spread them
Answer:
The correct answer is
b
Explanation:
First we can elimenate A and D because the pore size is the same.
C is wrong, there is still some urea in the blood, however is less
We are left with B which is the correct answer, i did the gizmo
Please leave a thanks and rate this answer 5 stars, you don't need an acount to do this.Please help. This is due today :(
Label the following.. Word bank is below
1. Where in the paramecium might you find proteins? Explain why?
In contrast to the red giant stage, the white dwarf stage will cause
A. the habitable zone to move outward past our solar system's borders.
B. The habitable zone to move back towards Saturn and its moons.
C. the habitable zone to rebound and return to Earth again.
D. The entire solar system to implode, destroying all planets.
(this question is like a mix of science and language arts because I'm on reading plus)
answer: b) The habitable zone to move back towards Saturn and its moons.
explanation: i just did the reading plus and that was the answer
Methamphetamine increases the brain's levels of dopamine, __________ and __________.
a) norepinephrine, serotonin
b) GABA, epinephrine
c) acetylcholine, enkephalins
d) glutamate, serotonin
Answer:
a) norepinephrine, serotonin
Explanation:
Neurotransmitters are special lipid-based molecules used in chemical signal transduction in the nervous system. They have receptor-specific roles in activating different regions of the central nervous system (CNS) and physiological responses. These include: dopamine, norepinephrine, and serotonin .
The CNS, which includes the brain and spinal cord, can be affected by certain drugs like methamphetamine. This drug is a stimulant that acts on brain regions such as:
prefrontal cortex the striatumthe nucleus accumbensIt causes the release of neurotransmitters while blocking their reuptake at synapses; meth is metabolized very slowly over time (12 hours). The buildup of dopamine, for instance, leads to altered moods, feelings of pleasure and euphoria.
Thus, this change or "high" leads to dependency by users for its mood-altering effect; however, less dopamine is released, and the pleasurable effects, become less potent. Studies show neurological damage with prolonged use, and habit formation and over time, addiction.
define the following term
Answer:
What is the following term?
Explanation:
What you are asking is vague, you should add a term to define.
Why were most test tubes incubated at 37 ⁰C?
Answer:
Optimal Growth Conditions
Explanation:
Different bacteria like to grow at different temperatures. By changing the temperature. Organisms that grow best at human body temperature, which is approximately 37 degrees Celsius (98.6 degrees Fahrenheit), are called mesophiles.
Hope this helps.
Plz help me with this question!!!!!!
Solution : It is a mixture of solvent (Major component mostly liquid) and solute (Minor component).
It is asking from a solution where water and solute are moving whether outise or inside.
_____________________________________As Per Hint Given:Solute ; Moves from higher concentration to the lower concentration by the process of diffusion.Solvent(Water) ; Moves from low solute area to the high solute area by the process of osmosis._____________________________________ROW 1 :26: Inside the cell (because inside the cell there is 5% solute(salt) whereas outside the cell it is 10%)
27: Outside the cell (outside the cell there is more concentration of salt so water moves out)
ROW 2:In Row 2 there is equal amount of salt outside and inside the cell so Solute and Solvent do not move because the solution is ISOTONIC
28: NO MOVEMENT
29: NO MOVEMENT
ROW 3:30: Glucose moves outside the cell
31: Water moves inside the cell (because glucose is more inside the cell)
ROW 432: Outside the cell (same reasons as above)
33: Inside the cell
ROW 534: NO MOVEMENT
35: NO MOVEMENT
ROW 636: Outside the cell
37: Inside the cell
ROW 738: Inside the cell
39: Outside the cell
ROW 840: Outside the cell
41: Inside the cell
ROW 942: Inside the cell
43: Outside the cell
_____________________________________Which label identifies the part of the ATP molecule that changes when energy is released in the cells of all living
things?
B
Р P Р
A
A
B
C
Answer: Respiration
Explanation:
Cellular respiration is the process by which nutrients such as glucose are broken down using oxygen to generate energy in the form of ATP, that is used to drive cellular processes.
ATP consists of an adenosine molecule bonded to three phosphate groups in a row. Energy from cellular respiration is stored in the bond between the 2nd and 3rd phosphate groups of ATP.
When the cell needs energy to do work, ATP loses its 3rd phosphate group, releasing energy stored in the bond that the cell can use to do work.
A diagram that is used to show the loss of energy as you go forward in a food chai
a.) food web
b.) energy pyramid
c.) concept map
d.) trophic levels
Answer:
tropical levels ........
The survival of some plants depends on their ability to have seeds transported to a favorable envioronment. what are the different ways seeds can be transported from one location to another?
Answer:
the wind can carry the seeds flowing water can carry seeds to different places some seeds can get stuck on people's clothes or on the fur of animals some seeds can be eaten by animals and dropped new places in their droppings
Explanation:
Hope this helps!
How is chromatin structurally different from chromosomes?
Answer:
The main difference between chromatin and chromosome is that chromatin consists of the unravelled condensed structure of DNA for the purpose of packaging into the nucleus whereas chromosome consists of the highest condensed structure of the DNA doublehelix
The phospholipid bilayer is composed of lipids which are _________ and do not dissolve well in water but do dissolve in oils. The phosphate head does dissolve in water because it is _________ just like water
Explanation:
which are hydrophobic
it is hydrophilic like water
Which is not a unique property of water
Answer:
A
Explanation:
All of the other options are specific to water, but quite a few liquids cool off a lot faster than water.
water cools very rapidly is not a unique property of water. Thus option A is correct.
what are the properties of water molecule ?It has no taste, odor, or transparency, where the nucleus of the oxygen atom attracts electrons strongly than the nuclei of the hydrogen atoms.
In water molecule oxygen is more electro negative and electron-greedy than hydrogen, results in the development of a partial negative charge on the oxygen of the water and a partial positive charge on the hydrogen end.
Water shows strong cohesive property where the attraction of molecules for other molecules of the same kind is referred to as cohesion.
Surface tension is defined as the tendency of the surface to resist rupture when they are subjected to stress due to cohesive forces.
For more details regarding water, visit:
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Your question was incomplete, so the complete question is
Which is not a unique property of water
A) water cools very rapidly
B) frozen water floats on liquid water
C) water molecules stick to each other through hydrogen bonds
D) water covered most of the earths surface and retains a large amount of heat
If the heart rate drops and the stroke volume increases, cardiac output will always show a
decrease.
O True
False
Answer:
False
Explanation:
hope this helped! :)
help! I'm grounded if I don't get a good grade on my test
Answer:
A is the answer
Explanation:
Hope I helped
Which type of root is important Taproot or fibrous root ? why ?
Answer:
A tap root system penetrates deep into the soil. In contrast, a fibrous root system is located closer to the soil surface, and forms a dense network of roots that also helps prevent soil erosion (lawn grasses are a good example, as are wheat, rice, and corn).
Explanation:
Answer:
Taproot is found in dicots, while a fibrous root is found in monocots. Fibrous root is found in most grasses, while taproot is not found in most grasses.
Why do planets close to the sun have thin atmospheres and the planets far away from the sun have thick atmospheres. Use what you know about the nebular theory.
Answer:
There are two primary factors: size and distance from the Sun. Gravity helps planets and moons to hold on to their atmospheres, so small planets/moons such as Mars and the Moon have thin atmospheres. The reason why the outer planets are larger is probably down to two major factors. The first is simply the amount of material available which may be accreted to a planet. Clearly, the further away from the Sun, the longer the orbit (twice as far means an orbit twice the physical length).
Explanation:
Which primate group is classified as hominins
the group consists of modern humans, extinct human species, and all our immediate ancestors.