Enzymes: Mechanism of Action and Clinical Uses
- Previous year questions on Enzymes: Mechanism of Action and Clinical Uses for NEET PG (National Eligibility cum Entrance Test - Postgraduate), from the Biochemistry section of the exam.
- Most questions here come from previous-year papers of Indian postgraduate medical entrance and licensing exams; where a paper and year are recorded the question carries them. The image-based questions are original vignettes written around an openly licensed figure, and were never asked in any exam.
- 17 live questions in Enzymes: Mechanism of Action and Clinical Uses.
- 2 of 17 questions carry a verified exam year: 2018, 2019.
- Biochemistry is worth about 16 of 300 questions on the exam. See every subject’s weightage.
- Question set last updated 3 Sept 2026.
Q1.The predominant isoenzyme of LDH in the cardiac muscle is
- ALDH - 1✓ Correct answer
- BLDH - 2
- CLDH - 3
- DLDH - 5
Q2.Carbonic anhydrase is an enzyme that occurs in plants, bacteria, and animals and is involved in the formation of which chemical?
- ACarbon dioxide from carbon and oxygen
- BCarbonic acid from carbon dioxide and water✓ Correct answer
- CBicarbonate ion from carbonic acid
- DHydrochloric acid
Q3.All are cofactors for Dehydrogenase except:
- ANADP
- BFAD
- CNAD
- DSAM✓ Correct answer
Q4.All the following are true of the active site of enzymes, except
- AShape is not rigid
- BAre preserved even after denaturation✓ Correct answer
- CBind the substrate with non-covalent bonds
- DAmino acids at the active site participate in catalysis
Q5.Marker of cell membrane is/are
- A5-Nucleotidase✓ Correct answer
- BLDH
- CGalactosyltransferase
- DCatalase
Q6.The enzyme studied in Triphyenyl tetrazolium chloride test (TTC) to detect myocardial infarction is
- ASDH✓ Correct answer
- BLDH
- CMDM
- DLecithinase
Q7.'Lock and Key model' of enzyme action was proposed by
- AEmil Fisher✓ Correct answer
- BDaniel Koshland
- CLenor Michaelis
- DMaud Menten
Q8.Which of the following indicates 'flipping effect'?
- ALDH2> LDH1
- BLDH1> LDH2✓ Correct answer
- CLDH2> LDH3
- DLDH2> LDH4
Q9.Which of the following acts as co-factor, not as coenzyme?
- AAscorbic acid✓ Correct answer
- BBiotin
- CThiamine
- DFolic acid
Q10.A material that speeds up a chemical reaction without chemically becoming involved is called:
- AA solvent
- BA base
- CA catalyst✓ Correct answer
- DThermoplastic
Answer key
Q1: A. LDH - 1; Q2: B. Carbonic acid from carbon dioxide and water; Q3: D. SAM; Q4: B. Are preserved even after denaturation; Q5: A. 5-Nucleotidase; Q6: A. SDH; Q7: A. Emil Fisher; Q8: B. LDH1> LDH2; Q9: A. Ascorbic acid; Q10: C. A catalyst.
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