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ira [324]
3 years ago
14

A major role of folate in cellular metabolism is the

Biology
1 answer:
morpeh [17]3 years ago
8 0
Synthesis of purine and pyrimidine bases in RNA and DNA
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Plate tectonics may affect organic evolution because movement of plates may cause a change in ____.
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Answer:

The correct answer would be b.  the environment.

Due to movement of tectonic plates the organisms would experience different environment. For example, different habitat, different food source et cetera.

As an adaptation to the changing environment different organisms would evolve in different species.

For example, in Galapagos island fiches had developed different sizes and shapes of beaks as a result of adaptation towards different environment.

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A black erminette chicken is crossed with a white erminette chicken. what color are the offspring
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They could be white or black. Black should be dominant, I guess, so 75% of offspring should be black.
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Which of the following investigators was (were) responsible for the following discovery? In DNA from any species, the amount of
Zarrin [17]

Answer :Erwin Chargaff   a Biochemist

Explanation:

He formulated the base paring of double helix of DNA. He reasoned that since the percentage of four  DNA  bases are of this proportions in human;

                                  Adenine=30.9% and Thymine =29.4%;

                                  Guanine=19.9% and Cytosine =19.8%

Then,  the amount of adenine will always be equal to thymine,

And the amount of Guanine equals to cytosine based on this percentages of distribution.  

(Adenine and Guanine are large, molecule of Purines, while thymine and Cytosine are Pyrimidine)  

 

He concluded (although scientist believed, he did not explicitly stated this) that this should be the base paring patterns in DNA molecule. This is the first Chargaff Rule.

His second rule is that the DNA composition, in the relative amount of the four bases Adenine, Thymine, Cytosine and Guanine varies in proportion from one organisms to another. And this is the basis of molecular diversity.

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