“Biomolecules” MCQ with Answer Explanation : NEET 2025

Here below some basic MCQ’s about “Biomolecules” chapter with answer which is explained in details. let’s check one by one which is given below.

MCQ 1:
Which of the following is a structural polysaccharide?

A) Starch
B) Glycogen
C) Cellulose
D) Sucrose

Answer: C) Cellulose

Explanation: Cellulose is a structural polysaccharide found in the cell walls of plants, providing rigidity and strength. Starch and glycogen are storage polysaccharides, while sucrose is a disaccharide.

MCQ 2:
Which of the following amino acids is classified as essential?

A) Alanine
B) Glutamine
C) Valine
D) Serine

Answer: C) Valine

Explanation: Essential amino acids cannot be synthesized by the body and must be obtained through diet. Valine is one of the essential amino acids, while alanine, glutamine, and serine are non-essential.

MCQ 3:
What type of bond links amino acids together in proteins?

A) Hydrogen bonds
B) Ionic bonds
C) Peptide bonds
D) Disulfide bonds

Answer: C) Peptide bonds

Explanation: Peptide bonds form between the amino group of one amino acid and the carboxyl group of another, linking amino acids together in a protein chain. Other bonds play roles in protein folding but do not link amino acids directly.

MCQ 4:
Which of the following biomolecules is primarily responsible for storing genetic information?

A) Proteins
B) Carbohydrates
C) Lipids
D) Nucleic acids

Answer: D) Nucleic acids

Explanation: Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information. Proteins perform various functions, while carbohydrates and lipids have different roles in energy storage and membrane structure.

MCQ 5:
Lipids are primarily characterized by which of the following properties?

A) Soluble in water
B) Insoluble in organic solvents
C) Nonpolar nature
D) High molecular weight

Answer: C) Nonpolar nature

Explanation: Lipids are primarily nonpolar and hydrophobic, making them insoluble in water but soluble in organic solvents. This characteristic is crucial for their role in forming cell membranes.

MCQ 6:
Which of the following is NOT a function of proteins?

A) Catalyzing biochemical reactions
B) Providing energy storage
C) Serving as structural components
D) Transporting molecules

Answer: B) Providing energy storage

Explanation: While proteins can be used for energy if necessary, their primary roles include catalyzing reactions (enzymes), structural support (e.g., collagen), and transport (e.g., hemoglobin). Energy storage is primarily the role of carbohydrates and fats.

MCQ 7:
Which vitamin is a coenzyme for the carboxylation of substrates in metabolic pathways?

A) Vitamin C
B) Vitamin B6
C) Vitamin K
D) Vitamin B12

Answer: C) Vitamin K

Explanation: Vitamin K plays a crucial role in carboxylating certain proteins required for blood clotting. Vitamin B6 is involved in amino acid metabolism, Vitamin C is an antioxidant, and Vitamin B12 is vital for red blood cell formation.

MCQ 8:
Which of the following is a saturated fatty acid?

A) Oleic acid
B) Linoleic acid
C) Stearic acid
D) Palmitoleic acid

Answer: C) Stearic acid

Explanation: Stearic acid is a saturated fatty acid, meaning it has no double bonds between carbon atoms. Oleic acid and palmitoleic acid are unsaturated, containing one or more double bonds, while linoleic acid is a polyunsaturated fatty acid.

MCQ 9:
What type of bond is responsible for the secondary structure of proteins?

A) Ionic bonds
B) Hydrogen bonds
C) Peptide bonds
D) Van der Waals forces

Answer: B) Hydrogen bonds

Explanation: The secondary structure of proteins, such as alpha helices and beta sheets, is primarily stabilized by hydrogen bonds between the backbone amine and carbonyl groups of the polypeptide chain.

MCQ 10:
Which of the following carbohydrates is a disaccharide?

A) Glucose
B) Fructose
C) Sucrose
D) Cellulose

Answer: C) Sucrose

Explanation: Sucrose is a disaccharide composed of glucose and fructose. Glucose and fructose are monosaccharides, while cellulose is a polysaccharide.