Question

Choose the correct answer from the alternatives given.
The difference between RNA and DNA is because of:

• A. Sugar and base
• B. Sugar and phosphate
• C. Phosphate and base
• D. Sugar only

Answer 1

The correct option is A Sugar and base

Both RNA and DNA consists of three parts, namely sugar molecule, nitrogenous bases and a phosphate molecule.

RNA and DNA differ in the type of sugar and bases present in both nucleic acids. RNA consists of ribose sugar whereas DNA consists of deoxyribose sugar (oxygen at 2nd position of ribose sugar is absent). Bases in RNA present are adenine, guanine, cytosine and uracil while in DNA uracil is replaced by a more stable base i.e. thymine.

Phosphate is common in both RNA and DNA.

So, the correct option is 'Sugar and base'.