Question

DNA differs from RNA in

• A. Nature of sugar alone
• B. Nature of sugar and pyrimidines
• C. Nature of purines alone
• D. All the above

Answer 1

Answer: (A)

DNA differs from the RNA because DNA has deoxyribose sugar while RNA has ribose sugar. The deoxyribose sugar has hydrogen at second carbon while the ribose sugar has the hydroxyl group at the second carbon of the hexose ring.

The nitrogenous bases are purines and pyrimidines. The purines are adenine and guanine. The pyrimidines are thymine, uracil, and cytosine. In RNA, the thymine present in DNA is replaced by uracil.

So, the correct answer is option C.