NEW DELHI: As the NEET UG 2025 exam date approaches, students preparing for the medical entrance exam are facing an increasing challenge in mastering the complex and often tricky concepts from the biology syllabus. Among the most challenging topics is Biomolecules, which tests students’ understanding of the fundamental building blocks of life, including proteins, nucleic acids, lipids, and carbohydrates.
NEET UG 2025: MCQs on Biomolecules
1. Question: Which of the following amino acids contains a sulfur atom?
a) Glycine
b) Methionine
c) Serine
d) Phenylalanine
Join NEET News 2025 2. Question: What is the primary function of ribosomal RNA (rRNA)?
a) Transcription of genetic material
b) Catalysis of protein synthesis
c) Carrying amino acids to the ribosome
d) Regulation of gene expression
3. Question: Which of the following biomolecules is NOT a carbohydrate?
a) Glucose
b) Fructose
c) Sucrose
d) Glycogen
4. Question: Which of the following is the bond formed between the sugar and phosphate group in a nucleic acid?
a) Peptide bond
b) Glycosidic bond
c) Phosphodiester bond
d) Hydrogen bond
5. Question: Which type of bond is responsible for the secondary structure of proteins?
a) Hydrogen bond
b) Disulfide bond
c) Ionic bond
d) Peptide bond
6. Question: Which of the following is a purine base in nucleic acids?
a) Thymine
b) Cytosine
c) Guanine
d) Uracil
7. Question: The structure of cellulose is best described as:
a) A branched polymer of glucose
b) A straight-chain polymer of glucose
c) A branched polymer of fructose
d) A straight-chain polymer of ribose
8. Question: Which of the following enzymes is responsible for the synthesis of RNA during transcription?
a) DNA polymerase
b) RNA polymerase
c) Ligase
d) Helicase
9. Question: Which of the following statements about enzymes is true?
a) Enzymes increase the activation energy of reactions.
b) Enzymes are consumed in the reaction.
c) Enzymes are highly specific for their substrates.
d) Enzymes change the equilibrium of reactions.
10. Question: What is the most abundant protein in the human body?
a) Actin
b) Collagen
c) Hemoglobin
d) Keratin
11. Question: Which of the following is an example of a disaccharide?
a) Glucose
b) Sucrose
c) Fructose
d) Galactose
12. Question: Which of the following is NOT a characteristic of enzymes?
a) Catalyze reactions by lowering activation energy
b) Are highly specific for substrates
c) Remain unchanged after a reaction
d) Operate at all temperatures
13. Question: Which of the following vitamins is essential for the synthesis of collagen?
a) Vitamin A
b) Vitamin B12
c) Vitamin C
d) Vitamin D
14. Question: The primary structure of a protein is determined by:
a) The number of amino acids
b) The sequence of amino acids
c) The folding pattern of the polypeptide chain
d) The hydrogen bonds between amino acids
15. Question: Which of the following polysaccharides is found in the cell walls of plants?
a) Starch
b) Glycogen
c) Cellulose
d) Chitin
16. Question: The structure of ATP is similar to:
a) RNA
b) DNA
c) NADPH
d) NADH
17. Question: Which of the following lipids are the main components of cell membranes?
a) Triglycerides
b) Phospholipids
c) Steroids
d) Waxes
18. Question: Which of the following is a characteristic of the quaternary structure of a protein?
a) The sequence of amino acids in a polypeptide chain
b) The folding of a polypeptide into a three-dimensional shape
c) The interaction of multiple polypeptide chains
d) The formation of a peptide bond between amino acids
19. Question: The enzyme amylase is responsible for the breakdown of:
a) Proteins
b) Fats
c) Starch
d) Nucleic acids
20. Question: Which of the following structures are responsible for carrying genetic information from the nucleus to the cytoplasm?
a) Ribosomes
b) Mitochondria
c) mRNA
d) tRNA
21. Question: In a nucleotide, the nitrogenous base is attached to the sugar molecule via which type of bond?
a) Phosphodiester bond
b) Glycosidic bond
c) Hydrogen bond
d) Peptide bond
22. Question: Which of the following is NOT a function of lipids in the body?
a) Energy storage
b) Hormone synthesis
c) Cell membrane structure
d) Genetic information storage
23. Question: Which of the following types of bonds are responsible for the secondary structure of proteins, such as alpha-helices and beta-pleated sheets?
a) Ionic bonds
b) Hydrogen bonds
c) Covalent bonds
d) Disulfide bonds
24. Question: Which of the following is a coenzyme involved in cellular respiration?
a) NADH
b) ATP
c) Coenzyme A
d) FADH2
25. Question: Which of the following is a type of RNA involved in protein synthesis?
a) mRNA
b) rRNA
c) tRNA
d) All of the above
Answer Keys: 1. b 2. b 3. d 4. c 5. a 6. c 7. b 8. b 9. c 10. b 11. b 12. d 13. c 14. b 15. c 16. a 17.b 18. c 19. c 20. c 21. b 22. d 23. b 24. c 25. d
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For students preparing for NEET UG 2025, the Biomolecules MCQs are an excellent resource to test their grasp of biochemistry. As the exam draws nearer, those who tackle these complex questions will not only prepare for the test but also deepen their understanding of the molecular machinery that keeps our bodies functioning.
