Question

Nucleotides are composed of:

• A. Pentose sugar and phosphoric acid
• B. Nitrogenous base, pentose sugar, and phosphoric acid
• C. Nitrogenous base and phosphoric acid
• D. Pentose sugar and nitrogenous base

Hint:

Nucleotides differ from nucleosides as they contain a phosphate group, which is essential for forming the DNA and RNA backbone.

Answer 1

The Correct Option is B

DNA and RNA are built from nucleotides. Each nucleotide comprises:
- A nitrogenous base (adenine and guanine are purines; thymine, cytosine, and uracil are pyrimidines)
- A pentose sugar (deoxyribose for DNA, ribose for RNA)
- A phosphate group, forming the nucleic acid backbone.

These elements facilitate genetic information storage and transfer.