The copying of the information in DNA is efficient because each strand of a DNA

Question

The copying of the information in DNA is efficient because each strand of a DNA molecule carries complementary information and can be used as a template during replication. the pairing of two DNA strands is antiparallel, and strands are held together via hydrogen bonds. the DNA molecule can be copied without disrupting the hydrogen bonds between bases. any purine (A or G) can pair with any pyrimidine (T or C). each strand of a DNA molecule can be used as a template during replication because each nitrogenous base pairs with an identical base via hydrogen bonding, e.g. A to A, G to G.

Explanation / Answer

The last option can be discarded because G always pairs with C and A with T.

Same goes for the second last option and so we discard that as well.

We know that hydrogen bonds between nitrogen bases are broken, while it is the phosphodiester bonds between the nucleotides that are not broken. So, the third option is culled.

Now, the second option says efficiency is due to the strands being held anti-parallel by the hydrogen bonds. But as we said earlier the hydrogen bonds do break and lose the preservation of arrangement that the option attributes the efficiency of DNA copying to. So we discard the second option.

The correct answer is the first option – each strand of DNA molecule carries complementary information and can be used as a template during replication.

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