Bioenergetics and the ETC
- Previous year questions on Bioenergetics and the ETC 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.
- 141 live questions in Bioenergetics and the ETC.
- 1 of 141 questions carries a verified exam year: 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.inhibitor of NADH-CoQ reductase in electron transport chain
- Arotenone✓ Correct answer
- Bphenoformin
- Ccarbomonoxide
- Dmalonate
Q2.Mammalian Mitochondria are involved in all of the following except –
- AFatty acid synthesis✓ Correct answer
- BDNA synthesis
- CFatty acid oxidation (β-oxidation)
- DProtein synthesis
Q3.Which of the following is not involved in generation of proton gradient?
- ANADPH dehydrogenase
- BCoenzyme Q cytoreductase
- CSuccinate CoQ reductase✓ Correct answer
- DCytochrome reductase
Q4.The mechanism of action of uncouplers of oxidative phosphorylation involves:
- AInhibition of ATP synthase
- BStimulation of ATP synthase
- CDisruption of proton gradient across the inner membrane✓ Correct answer
- DDisruption of proton gradient across outer membrane
Q5.Type IV complex of ETC is inhibited by
- AOligomycin
- BAntimycin
- CCyanide✓ Correct answer
- DCO2
Q6.A child to emergency with accidental ingestion of cyanide. It blocks citric acid cycle by blocking:
- AAconitase
- BAcetyl-CoA production
- CNAD✓ Correct answer
- DCitrate
Q7.All of the following processes take place in mitochondria except:
- ABeta-oxidation of fatty acids
- BDNA synthesis
- CFatty acid synthesis✓ Correct answer
- DProtein synthesis
Q8.Firefilies produce light due to:
- ANADH
- BGTP
- CATP✓ Correct answer
- DPhosphocreatinine
Q9.Which of the following inhibits oxidative phosphorylation by inhibiting the transpo of ADP into and ATP out of the mitochondrion?
- AAtractyloside✓ Correct answer
- B2,4-dinitrophenol
- CCarbon monoxide
- DRotenone
Q10.Barbiturates act on which step of mitochondrial respiratory chain?
- ACompelx 1 to co-enzyme Q✓ Correct answer
- BCompelx 2 to co-enzyme Q
- CCo-enzyme Q to compelx 3
- DCytochrome C to compelx 4
Answer key
Q1: A. rotenone; Q2: A. Fatty acid synthesis; Q3: C. Succinate CoQ reductase; Q4: C. Disruption of proton gradient across the inner membrane; Q5: C. Cyanide; Q6: C. NAD; Q7: C. Fatty acid synthesis; Q8: C. ATP; Q9: A. Atractyloside; Q10: A. Compelx 1 to co-enzyme Q.
Other topics in Biochemistry
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- Glycogen Metabolism and Storage Diseases
- HMP Shunt with Fructose and Galactose Metabolism
- Krebs Cycle
- Amino Acids: Structure and Classification
- Amino Acid Metabolism and Nitrogen Handling
- Inborn Errors of Amino Acid Metabolism
- Levels of Protein Structure and Function
- Urea Cycle and Hyperammonaemia
- Lipids: Classification and Chemistry
- Beta-Oxidation and Ketone Body Formation
- Fatty Acid Synthesis and Eicosanoids
- Acylglycerol and Sphingolipid Metabolism
- Cholesterol Metabolism and Lipoprotein Transport
- Haem Synthesis, Porphyrias and Bile Pigments
- Enzymes: Mechanism of Action and Clinical Uses
- Enzyme Kinetics, Inhibition and Regulation
- Fat-Soluble Vitamins: A, D, E and K
- B-Complex Vitamins in Energy Metabolism
- Folate, Vitamin B12 and Other Vitamins
- Minerals and Antioxidant Systems
- Nucleotide Metabolism and Its Disorders
- DNA Packaging, Replication and Repair
- Transcription and RNA Processing
- Translation and Post-Translational Modification
- Control of Gene Expression
- Recombinant DNA and Genomic Techniques