NEET Chemistry: Biochemistry questions with solutions

Q1. Guanine is an example of:

1. Nucleotide
2. Nucleoside
3. Purine base
4. Pyrimidine base

Answer: Purine base

Guanine is one of the two purine nitrogenous bases found in nucleic acids. It is not a nucleotide or nucleoside because it lacks sugar and phosphate, and it is not a pyrimidine because it has a fused double-ring structure.

Q2. Amino acids are building blocks of:

1. carbohydrates
2. proteins
3. vitamins
4. fats

Answer: proteins

Amino acids are the monomers that combine to form polypeptides, which fold into proteins. Carbohydrates, vitamins, and fats are built from different types of molecules.