Question

The pentose sugar present in DNA is ribose.

• A. True
• B. False

Answer 1

The correct option is B False

DNA:

1. DNA i.e. deoxyribonucleic acid has a double helix structure.
2. DNA is composed of repeating nucleotides.
3. Each nucleotide is made up of a pentose sugar i.e. deoxyribose sugar, a phosphate group, and a nitrogenous base.
4. DNA has four types of nitrogenous bases: Adenine, Guanine, Thymine, and Cytosine.
5. Sugar acts as the backbone of the DNA and the base is responsible for the genetic code.
6. The nitrogenous bases are of two types: Purines and Pyrimidines.
7. Purines are bases having two carbon-nitrogen rings while pyrimidines are bases containing one carbon-nitrogen ring.
8. Adenine and guanine are purines while thymine and cytosine are pyrimidines.
9. Two bases link by a hydrogen bond and form base pairs.
10. Base pairs in DNA are Adenine - Thymine, and Guanine - Cytosine.

Final answer: The given statement is false.