Biochemistry MCQs
Biochemistry MCQs play a vital role in preparing students for understanding life at the molecular level. These MCQs include topics such as carbohydrate metabolism, lipid and protein structures, enzymes, vitamins, DNA/RNA, and clinical applications. These quizzes are essential for students appearing in MDCAT, USMLE, FCPS, and other competitive exams. Regular practice enhances understanding of how biochemical processes affect human health and disease.
Q: End product of aerobic glycolysis
A) Acetyl-CoA
B) Ethanol
C) Pyruvate
D) Lactic acid
✅ Correct Answer: C
Explanation: Pyruvate is the product of glycolysis when oxygen is available.
Q: Component not found in RNA
A) Thymine
B) Ribose
C) Phosphate
D) Uracil
✅ Correct Answer: A
Explanation: RNA contains uracil instead of thymine found in DNA.
Q: Lipid-soluble vitamin important for vision
A) Vitamin K
B) Vitamin C
C) Vitamin D
D) Vitamin A
✅ Correct Answer: D
Explanation: Vitamin A is essential for the synthesis of rhodopsin in the retina.
Q: Enzyme class that removes water during a reaction
A) Lyase
B) Isomerase
C) Hydrolase
D) Oxidoreductase
✅ Correct Answer: A
Explanation: Lyases catalyze reactions involving removal of groups without hydrolysis, often forming double bonds.
Q: Biochemical molecule classified as a coenzyme
A) NAD+
B) Insulin
C) ATP
D) DNA
✅ Correct Answer: A
Explanation: NAD+ acts as a coenzyme in redox reactions by accepting electrons.
Q: Macromolecule primarily responsible for catalyzing reactions
A) Nucleic acids
B) Proteins
C) Lipids
D) Carbohydrates
✅ Correct Answer: B
Explanation: Proteins function as enzymes, speeding up biochemical reactions.
Q: Site of cholesterol synthesis in the cell
A) Ribosome
B) Mitochondria
C) Smooth endoplasmic reticulum
D) Nucleus
✅ Correct Answer: C
Explanation: Smooth ER contains the enzymes necessary for cholesterol biosynthesis.
Q: Type of enzyme that transfers a phosphate group
A) Ligase
B) Kinase
C) Isomerase
D) Hydrolase
✅ Correct Answer: B
Explanation: Kinases are enzymes that catalyze the transfer of phosphate groups.
Q: Biomolecule serving as the genetic code translator
A) RNA polymerase
B) DNA
C) mRNA
D) ATP
✅ Correct Answer: C
Explanation: mRNA carries genetic instructions from DNA to the ribosome for protein synthesis.
Q: Biochemical process producing urea
A) Gluconeogenesis
B) Urea cycle
C) Glycolysis
D) Photosynthesis
✅ Correct Answer: B
Explanation: Urea is formed in the liver through the urea cycle to eliminate excess nitrogen.