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Q.

Which of the following components form the backbone of a polynucleotide chain?

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a

Sugar and phosphates

b

Sugar and nitrogenous bases

c

Nitrogenous bases and phosphates

d

Sugar and Purines

answer is A.

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Detailed Solution

The backbone of a polynucleotide chain is formed due to sugar and phosphates. The nitrogenous bases linked to sugar moiety project from the backbone.
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