Which of the following statements about DNA is not correct?

1. It has a double helix structure
2. Adenine forms hydrogen bonds with thymine and cytosine forms hydrogen bonds with guanine
3. The two strands in a DNA molecule are not complementary to each other
4. It contains the pentose sugar, 2-deoxyribose

Solution

I. DNA has a double helix structure.
II. Adenine form hydrogen bond with thymine $A=T$ ) and cytocine forms hydrogen bond with guanine $(C \equiv G)$. III. The two strands in DNA molecules are complementary to each other. IV. DNA strand contains pentose -2-deoxyribose sugar. Thus, option (c) is inorrect.

Asked in: AP EAMCET 2019 (20 Apr Shift 2)

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