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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. | |