MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which enzyme is involved in the pathway of synthesis of acetyl-coA? |
| A. | Hexokinase |
| B. | Pyruvate decarboxylase |
| C. | Pyruvate dehydrogenase |
| D. | Pyruvate kinase |
| Answer» D. Pyruvate kinase | |
| 2. |
Which enzyme is involved in the pathway of ethanol fermentation? |
| A. | Hexokinase |
| B. | Pyruvate decarboxylase |
| C. | Pyruvate dehydrogenase |
| D. | Pyruvate kinase |
| Answer» C. Pyruvate dehydrogenase | |
| 3. |
What are the end products in ethanol fermentation? |
| A. | Ethanol and CO<sub>2</sub> |
| B. | Ethanol and O<sub>2</sub> |
| C. | Ethanol, H<sub>2</sub> and CO<sub>2</sub> |
| D. | Ethanol, O<sub>2</sub> and CO<sub>2</sub> |
| Answer» B. Ethanol and O<sub>2</sub> | |
| 4. |
TPP (thiamine pyrophosphate) is derived from ____________ |
| A. | Vitamin A |
| B. | Vitamin B1 |
| C. | Vitamin C |
| D. | Vitamin B2 |
| Answer» C. Vitamin C | |
| 5. |
For its activity, pyruvate decarboxylase requires ______________ |
| A. | Mg<sup>+2</sup> |
| B. | Ca<sup>+2</sup> |
| C. | Na<sup>+</sup> |
| D. | H<sup>+</sup> |
| Answer» B. Ca<sup>+2</sup> | |
| 6. |
In the reduction of pyruvate to lactate, which of the following is regenerated? |
| A. | H<sup>+</sup> |
| B. | NADH |
| C. | NAD<sup>+</sup> |
| D. | Na<sup>+</sup> |
| Answer» D. Na<sup>+</sup> | |
| 7. |
When one molecule of glucose is oxidized to two molecules of lactate during anaerobic glycolysis, which of the following statements is false? |
| A. | Glyceraldehyde 3-P dehydrogenase reaction produces 2 ATP molecules |
| B. | Lactate dehydrogenase reaction produces no ATP |
| C. | Pyruvate kinase reaction produces 2 ATP molecules |
| D. | Phosphofructokinase-1 reaction uses 1 ATP molecule |
| Answer» B. Lactate dehydrogenase reaction produces no ATP | |
| 8. |
When glucose is converted to lactate by anaerobic glycolysis, equivalent number of ATPs derived is? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 9. |
Which is the major factor(s) determining whether glucose is oxidized by aerobic or anaerobic glycolysis? |
| A. | Ca<sup>+2</sup> |
| B. | FADH<sub>2</sub> |
| C. | NADH and the ATP/ADP ratio |
| D. | Presence of high AMP |
| Answer» D. Presence of high AMP | |
| 10. |
Which of the following is true about the enzyme producing NADH from a triose phosphate in the glycolytic pathway? |
| A. | It produces 1, 3-biphosphoglycerate and NADH |
| B. | It catalyzes irreversible reaction |
| C. | It uses NAD<sup>+</sup> and dihydroxyacetone phosphate as substrates |
| D. | It uses FADH<sub>2</sub> and glyceraldehyde 3-phosphate as substrates |
| Answer» B. It catalyzes irreversible reaction | |