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: Denaturation affects a protein's
A) Molecular weight
B) Folding and shape
C) Genetic code
D) Primary structure
✅ Correct Answer: B
Explanation: Denaturation disrupts the secondary and tertiary structures.
Q: ATP is composed of
A) Thymine and phosphate
B) Glucose and ribose
C) Adenine, ribose, and phosphate
D) Ribose and uracil
✅ Correct Answer: C
Explanation: ATP consists of adenine, ribose sugar, and three phosphate groups.
Q: Water is essential in biochemistry due to its
A) Hydrophobic nature
B) High acidity
C) Solvent properties
D) Insolubility
✅ Correct Answer: C
Explanation: Water dissolves many biomolecules, facilitating biochemical reactions.
Q: Disaccharides are formed by
A) Sublimation
B) Oxidation
C) Condensation
D) Hydrolysis
✅ Correct Answer: C
Explanation: Disaccharides form through a condensation reaction between two monosaccharides.
Q: Most abundant protein in the human body is
A) Actin
B) Collagen
C) Hemoglobin
D) Insulin
✅ Correct Answer: B
Explanation: Collagen provides structural support in connective tissues.
Q: pH measures the
A) Enzyme activity
B) Hydrogen ion concentration
C) Volume
D) Pressure
✅ Correct Answer: B
Explanation: pH indicates the acidity or basicity of a solution.
Q: Hydrolysis involves
A) Water removal
B) Water addition
C) Carbon fixation
D) Oxygen release
✅ Correct Answer: B
Explanation: Hydrolysis breaks bonds by adding water molecules.
Q: The sugar in RNA is
A) Sucrose
B) Deoxyribose
C) Ribose
D) Glucose
✅ Correct Answer: C
Explanation: RNA contains ribose as its sugar component.
Q: Fatty acids are long chains of
A) Hydrocarbons
B) Amino acids
C) Nucleotides
D) Sugars
✅ Correct Answer: A
Explanation: Fatty acids are composed of hydrocarbon chains with a carboxyl group.
Q: Insulin regulates the level of
A) DNA
B) Glucose
C) Oxygen
D) ATP
✅ Correct Answer: B
Explanation: Insulin lowers blood glucose by facilitating its uptake into cells.