Question

How can A distinguish T from C

Answer 1

Explanation:

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Answer 2

Way of distinguishing is written below -

•In the question, A refers to adenine, t refers to thymine and C refers to cytosine. During DNA replication, bonding between purines and pyrimidines occur in the DNA polymerase enzyme.

•It has a hand like structure. It makes sure that purines always binds with pyrimidines and vice versa.

•Therefore, adenine being purine always binds with pyrimidine thymine and guanine always binds with cytosine.

•Now adenine will always bind with thymine because there are two hydrogen bond formation between the two and guanine will always bind with cytosine because there are three hydrogen bond formation between the two.

•Error in correct binding here is checked during proof reading, if still the error is not encountered or corrected then mutation occurs.