MCQOPTIONS
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MCQOPTIONS
This section includes 18 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 of the following statements about gluconeogenesis is correct? |
| A. | Pyruvate is first converted to phosphoenolpyruvate by phosphoenolpyruvate carboxykinase |
| B. | Fructose 1, 6-biphosphatase converts fructose 1, 6-bisphosphate into fructose 1-phosphate |
| C. | Glucose 6-phosphatase hydrolyzes glucose 6-phosphate to release glucose into the blood |
| D. | Glucose 6-phosphatase hydrolyzes glucose 6-phosphate and is found in liver and muscle |
| Answer» D. Glucose 6-phosphatase hydrolyzes glucose 6-phosphate and is found in liver and muscle | |
| 2. |
What is the main source of glucose carbons for gluconeogenesis? |
| A. | Guanine |
| B. | Alanine |
| C. | Cysteine |
| D. | Threonine |
| Answer» C. Cysteine | |
| 3. |
Ethanol is oxidized to acetaldehyde in the liver cytoplasm by ____________ |
| A. | Alcohol dehydrogenase |
| B. | Alcohol carboxylase |
| C. | Pyruvate carboxylase |
| D. | Pyruvate kinase |
| Answer» B. Alcohol carboxylase | |
| 4. |
Formation of one molecule of glucose from pyruvate requires ____________ |
| A. | 4 ATP, 2 GTP and 2 NADH |
| B. | 3 ATP, 2 GTP and 2 NADH |
| C. | 4 ATP, 1 GTP and 2 NADH |
| D. | 2 ATP, 2 GTP and 2 NADH |
| Answer» B. 3 ATP, 2 GTP and 2 NADH | |
| 5. |
Which of the following organisms cannot convert acetyl-coA derived from fatty acids into glucose? |
| A. | Animals |
| B. | Plants |
| C. | Bacteria |
| D. | Virus |
| Answer» B. Plants | |
| 6. |
Gluconeogenesis involves the conversion of ____________ |
| A. | Glucose to pyruvate |
| B. | Pyruvate to glucose |
| C. | Phosphoenolpyruvate to glucose |
| D. | Pyruvate to fructose |
| Answer» C. Phosphoenolpyruvate to glucose | |
| 7. |
Oxaloacetate is reduced to malate by ____________ |
| A. | Pyruvate carboxylase |
| B. | Malate dehydrogenase |
| C. | Pyruvate kinase |
| D. | Phosphofructokinase-1 |
| Answer» C. Pyruvate kinase | |
| 8. |
Which enzyme catalyzes the conversion of pyruvate to oxaloacetate? |
| A. | Pyruvate carboxylase |
| B. | Pyruvate dehydrogenase |
| C. | Pyruvate kinase |
| D. | Phosphofructokinase-1 |
| Answer» B. Pyruvate dehydrogenase | |
| 9. |
THE_MAIN_SOURCE_OF_GLUCOSE_CARBONS_FOR_GLUCONEOGENESIS_IS?$ |
| A. | Guanine |
| B. | Alanine |
| C. | Cysteine |
| D. | Threonine |
| Answer» C. Cysteine | |
| 10. |
Which of the following statements about gluconeogenesis is correct?$ |
| A. | Pyruvate is first converted to phosphoenolpyruvate by phosphoenolpyruvate carboxykinase |
| B. | Fructose 1, 6-biphosphatase converts fructose 1, 6-bisphosphate into fructose 1-phosphate |
| C. | Glucose 6-phosphatase hydrolyzes glucose 6-phosphate to release glucose into the blood |
| D. | Glucose 6-phosphatase hydrolyzes glucose 6-phosphate and is found in liver and muscle |
| Answer» D. Glucose 6-phosphatase hydrolyzes glucose 6-phosphate and is found in liver and muscle | |
| 11. |
Ethanol is oxidized to acetaldehyde in the liver cytoplasm b? |
| A. | Alcohol dehydrogenase |
| B. | Alcohol carboxylase |
| C. | Pyruvate carboxylase |
| D. | Pyruvate kinase |
| Answer» B. Alcohol carboxylase | |
| 12. |
Formation of one molecule of glucose from pyruvate requires |
| A. | 4 ATP, 2 GTP and 2 NADH |
| B. | 3 ATP, 2 GTP and 2 NADH |
| C. | 4 ATP, 1 GTP and 2 NADH |
| D. | 2 ATP, 2 GTP and 2 NADH |
| Answer» B. 3 ATP, 2 GTP and 2 NADH | |
| 13. |
Which of the following organisms cannot covert acetyl-coA derived from fatty acids into glucose? |
| A. | Animals |
| B. | Plants |
| C. | Bacteria |
| D. | Virus |
| Answer» B. Plants | |
| 14. |
Gluconeogenesis involves conversion of |
| A. | Glucose to pyruvate |
| B. | Pyruvate to glucose |
| C. | Phosphoenolpyruvate to glucose |
| D. | Pyruvate to fructose |
| Answer» C. Phosphoenolpyruvate to glucose | |
| 15. |
Oxaloacetate is reduced to malate by |
| A. | Pyruvate carboxylase |
| B. | Malate dehydrogenase |
| C. | Pyruvate kinase |
| D. | Phosphofructokinase-1 |
| Answer» C. Pyruvate kinase | |
| 16. |
The enzyme which catalyzes the conversion of pyruvate to oxaloacetate |
| A. | Pyruvate carboxylase |
| B. | Pyruvate dehydrogenase |
| C. | Pyruvate kinase |
| D. | Phosphofructokinase-1 |
| Answer» B. Pyruvate dehydrogenase | |
| 17. |
Which of the following statements is false about gluconeogenesis? |
| A. | From the hydrolysis of tri-acyl-glycerol, fatty acids can be used as a carbon source |
| B. | From red blood cells, lactate can be used as a carbon source |
| C. | From the hydrolysis of tri-acyl-glycerol, glycerol is converted to glucose in gluconeogenesis |
| D. | From muscle vigorous muscle activity, lactate can be used as a carbon source |
| Answer» B. From red blood cells, lactate can be used as a carbon source | |
| 18. |
Which of the following is not an important precursor of glucose in animals? |
| A. | Lactate |
| B. | Pyruvate |
| C. | Glycerol |
| D. | Glucose 6-phosphate |
| Answer» E. | |