Which of the following is correct for DNA?

Adenine pairs with guanine by covalent bonds

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Adenine pairs with thymine by 3 hydrogen bonds

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Guanine pairs with cytosine by 3 covalent bonds

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A purine always pairs with a pyrimidine

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Solution

The correct option is D A purine always pairs with a pyrimidine
In a DNA, purine always pairs with a pyrimidine. Adenine pairs with thymine by two hydrogen bonds and guanine pairs with cytosine by three hydrogen bonds.

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Which of the following regarding DNA replication, is/are correct?

H

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