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Anettt [7]
3 years ago
12

What primitive form did nucleic acids take?

Biology
1 answer:
AVprozaik [17]3 years ago
3 0
The answer: ribonucleic acid (RNA)

Explanation: RNA was the first molecule of heredity, so it evolved all the essential methods for storing and expressing genetic information before DNA came into the scene.
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Scientists studying hair samples can tell how long it has been since someone dyed or bleached their hair.
NISA [10]
False. It shows the DNA of someone.
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3 years ago
Apple maggots are a type of fly native to North America. Prior to the introduction of the apple tree to North America, apple mag
scoundrel [369]

Answer:

B

Explanation:

B is the most likely consequence because of the following facts we are told:

  • After apple trees were introduced, some apple maggots began feeding from and laying their eggs on apple trees
  • Adult apple maggots will only mate on the type of tree on which they were born.

This provides a geographical isolation (because they are feeding and laying eggs on separate trees) and reproductive isolation (because they will only mate on the type of tree on which they are born).

These two factors increase the chances that apple maggots feeding on apple trees will only encounter those who have mated on the same tree, and continue to mate this way. Over time, the populations (i.e. apple tree vs hawthorn tree) will intermix less and less. This will mean the genetic pool will become distinct, and natural selection will be acting differently (different habitats and different genes), encouraging speciation.

7 0
3 years ago
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Gorter and grendel extracted lipids from human red blood cells. they calculated the total surface area for these red blood cells
Anastaziya [24]
<span>The calculated to surface area for red blood cells by Gorter and Grendel found to be 36u2.

 The surface area that would be covered once they spread across the surface of the water is 72u2.

If they spread across the surface area will double. This is because the lipid bilayer with phospholipid the head faces the water on each surface of the membrane.
 It clearly shows that there must be more to membranes than lipid bilayer because membranes grew and the surface tension of membranes is much lower than those of pure lipid structures.</span>
7 0
4 years ago
The nurse is caring for a client on the rehabilitation unit who has hearing loss. in planning care, the nurse documents ways to
enot [183]
<span>The nurse should stand or sit within the line of vision for the patient, close the door to his/her room so minimize noise, reduce distractions by turning on televisions and removing visitors, ,be certain the clients hearing aid is working properly, and be sure to get the clients attention before beginning any discussions.</span>
7 0
3 years ago
Why do most particles in solar wind not reach Earth’s surface?
Inessa [10]

Answer:

Due to the dense atmosphere

The magnetic field of the earth

Explanation:

Most particles in the solar wind do not reach the earth's surface because the atmosphere is very dense and the protecting magnetic field of the earth.

A solar wind is a burst of energetic particles from the sun which are made up electrons, ions, etc.. They travel at a very high velocity.

  • The magnetic field of the earth is able to deflect these charged particles away.
  • In areas such as the pole, the interact with the atmosphere to produce very stunning auroras.
6 0
3 years ago
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