- A) Conversion of glucose to glucose-6-phosphate
- B) Conversion of phosphoenolpyruvate to pyruvate
- C) Conversion of dihydroxyacetone phosphate to glyceraldehyde-3-phosphate
- D) None generate water directly
Biochemistry MCQ
Total MCQ: 92
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12 What type of phosphorylation occurs during glycolysis?
- A) Oxidative phosphorylation
- B) Substrate-level phosphorylation
- C) Photophosphorylation
- D) Chemiosmotic phosphorylation
13 In which cellular component does substrate-level phosphorylation occur during glycolysis?
- A) Mitochondria
- B) Cytoplasm
- C) Nucleus
- D) Endoplasmic reticulum
14 Which of the following statements about glycolytic intermediates is true?
- A) They can easily diffuse out of the cell.
- B) Most are phosphorylated metabolites.
- C) They do not participate in other metabolic pathways.
- D) They are all five-carbon sugars.
15 What regulates the flux through the irreversible steps in glycolysis?
- A) Concentration of substrates
- B) Activity levels of specific enzymes
- C) Availability of oxygen
- D) All of these factors
16 What happens to NAD+ during glycolysis?
- A) It is consumed.
- B) It is reduced to NADH.
- C) It is oxidized.
- D) It is converted to FADH2.
17 What does the term “ATP payoff phase” refer to in glycolysis?
- A) The phase where ATP is consumed
- B) The phase where ATP is generated
- C) The phase where glucose is broken down
- D) The phase where NADH is produced
18 Which reaction in glycolysis has a large negative ΔG and is essentially irreversible?
- A) Reaction 1 (Hexokinase)
- B) Reaction 5 (Triose phosphate isomerase)
- C) Reaction 7 (Phosphoglycerate kinase)
- D) Reaction 10 (Pyruvate kinase)
19 Which of the following sugars can enter glycolysis?
- A) Sucrose
- B) Fructose
- C) Galactose
- D) All of the above
20 What does fructose-6-phosphate convert into during glycolysis?
- A) Glucose-6-phosphate
- B) Fructose-1,6-bisphosphate
- C) Glyceraldehyde-3-phosphate
- D) Pyruvate