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: Denaturation of proteins affects
A) DNA sequence
B) Quaternary structure only
C) Higher-level structures
D) Primary structure
✅ Correct Answer: C
Explanation: Denaturation disrupts secondary, tertiary, and quaternary structures.
Q: Energy currency of the cell
A) NADH
B) Glucose
C) ATP
D) GTP
✅ Correct Answer: C
Explanation: ATP stores and transfers energy within cells, making it the primary energy currency.
Q: Most abundant protein in the human body
A) Albumin
B) Myosin
C) Collagen
D) Hemoglobin
✅ Correct Answer: C
Explanation: Collagen provides structural support in connective tissues and is the most abundant protein.
Q: Site of glycolysis in the cell
A) Nucleus
B) Endoplasmic reticulum
C) Cytoplasm
D) Mitochondria
✅ Correct Answer: C
Explanation: Glycolysis occurs in the cytoplasm, where glucose is broken down into pyruvate.
Q: Monosaccharide absorbed without digestion
A) Lactose
B) Sucrose
C) Glucose
D) Maltose
✅ Correct Answer: C
Explanation: Glucose is already a simple sugar and can be absorbed directly into the bloodstream.