What is a likely reason for thymine replacing uracil in DNA? Select one: a. Ther

Question

What is a likely reason for thymine replacing uracil in DNA?

Select one:

a. There was no specific reason; this was a chance event with no selective pressure favouring the replacement.

b. Thymine is a more common pyrimidine than uracil so its inclusion in DNA was favoured.

c. Thymine base pairs with adenine as it has a higher bond energy compared to uracil; therefore DNA composed of thymine is more stable than that made with uracil.

d. The deamination product of cytosine is uracil; thus if uracil were a component of DNA it would be impossible to repair DNA following the deamination of cytosine.

e. None of the above.

Explanation / Answer

ans... d...the deamination product of cytosine is uracil,thus if uracil were a component of DNA,it would be impossible to repair DNA following the deamination of cytosine.uracil is produced by the deamination of cytosine.so having thymine as normal base makes the detection and repair of such mutations more efficient.

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