Biochemistry MCQs
Biochemistry MCQs cover enzymes, metabolism, vitamins, nucleic acids, and clinical correlations. Perfect for MDCAT, USMLE, FCPS, and competitive exams, these quizzes strengthen molecular biology concepts and link biochemical processes to human health and disease.
Q: Enzymes act by lowering
A) Substrate size
B) Temperature
C) Activation energy
D) pH level
✅ Correct Answer: C
Explanation: Enzymes reduce the activation energy required to initiate a reaction.
Q: Amino acids join together by forming
A) Ionic bonds
B) Glycosidic bonds
C) Peptide bonds
D) Hydrogen bonds
✅ Correct Answer: C
Explanation: Peptide bonds link amino acids in proteins.
Q: Lipids are insoluble in
A) Benzene
B) Water
C) Chloroform
D) Ether
✅ Correct Answer: B
Explanation: Lipids are hydrophobic and do not dissolve in water.
Q: The building blocks of nucleic acids are
A) Nucleotides
B) Amino acids
C) Fatty acids
D) Monosaccharides
✅ Correct Answer: A
Explanation: Nucleotides form DNA and RNA chains.
Q: DNA differs from RNA by containing
A) Uracil
B) Deoxyribose
C) Thymine
D) Ribose
✅ Correct Answer: C
Explanation: DNA contains thymine while RNA contains uracil.