Selected MCQ

Current Question
Enzyme specificity is primarily determined by the:
  • A. Number of peptide bonds
  • B. Shape and chemical environment of the active site
  • C. Presence of DNA in the cytoplasm
  • D. Color of the substrate
Correct Answer: B
Explanation:
Complementary structure and chemistry of the active site govern substrate binding and catalysis.
Related Question 1
Which enzyme breaks starch?
  • A. Lipase
  • B. Amylase
  • C. Protease
  • D. Nuclease
Correct Answer: B
Explanation:
Amylase digests starch.
Related Question 2
Which enzyme catalyzes RNA synthesis?
  • A. DNA polymerase
  • B. RNA polymerase
  • C. Ligase
  • D. Helicase
Correct Answer: B
Explanation:
RNA polymerase transcribes DNA.
Related Question 3
Which enzyme converts glucose to glucose-6-phosphate?
  • A. Hexokinase
  • B. Ligase
  • C. Amylase
  • D. Lipase
Correct Answer: A
Explanation:
First step of glycolysis.
Related Question 4
Which organelle contains hydrolytic enzymes?
  • A. Mitochondria
  • B. Lysosome
  • C. Golgi
  • D. Ribosome
Correct Answer: B
Explanation:
Lysosomes digest cellular waste.
Related Question 5
Which biomolecule is enzyme?
  • A. Lipid
  • B. Protein
  • C. Carbohydrate
  • D. DNA
Correct Answer: B
Explanation:
Enzymes are proteins.