MCQOPTIONS
Saved Bookmarks
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. |
Conversion of xylulose 5-phosphate to ribulose 5-phosphate is catalyzed by ___________ |
| A. | Phosphopentose epimerase |
| B. | Transaldolase |
| C. | Transketolase |
| D. | Phosphopentose isomerase |
| Answer» B. Transaldolase | |
| 2. |
The use of NADPH generated from pentose phosphate pathway cannot be ____________ |
| A. | oxidized in the electron transport chain to provide 38 ATPs |
| B. | Used for the synthesis of fatty acids |
| C. | Used for the macrophageal functions |
| D. | Used for steroid synthesis |
| Answer» B. Used for the synthesis of fatty acids | |
| 3. |
Which of the following statements is correct about the reductive pentose phosphate pathway? |
| A. | It is not reversible |
| B. | Transketolase transfers 3 carbon units |
| C. | Transaldose transfers 2 carbon units |
| D. | Pentoses can provide glycolytic intermediates |
| Answer» E. | |
| 4. |
Which one of the following statements is correct about the pentose phosphate pathway? |
| A. | It generates 6 moles of CO2 for each mole of glucose consumed |
| B. | It generates 38 mol of ATP per mole of glucose consumed |
| C. | It is a reductive pathway that consumes NADH |
| D. | Present in plants but not in animals |
| Answer» B. It generates 38 mol of ATP per mole of glucose consumed | |
| 5. |
What is the main function of the pentose phosphate pathway? |
| A. | Supply NADP+ |
| B. | Supply NADH |
| C. | Supply energy |
| D. | Supply pentoses and NADPH |
| Answer» E. | |
| 6. |
Oxidation of 3 molecules of glucose by pentose phosphate pathway results in the production of ____________ |
| A. | 3 molecules of pentose, 6 molecules of NADPH and 3 molecules of CO2 |
| B. | 4 molecules of pentose, 6 molecules of NADPH and 3 molecules of CO2 |
| C. | 4 molecules of pentose, 3 molecules of NADPH and 3 molecules of CO2 |
| D. | 3 molecules of pentose, 4 molecules of NADPH and 3 molecules of CO2 |
| Answer» B. 4 molecules of pentose, 6 molecules of NADPH and 3 molecules of CO2 | |
| 7. |
Which one out of the following enzymes acts in the pentose phosphate pathway? |
| A. | Aldolase |
| B. | Glycogen phosphorylase |
| C. | Pyruvate kinase |
| D. | 6-phosphogluconate dehydrogenase |
| Answer» E. | |
| 8. |
What is the first reaction of the pentose phosphate pathway? |
| A. | Oxidation of glucose 6-phosphate to 6-phosphoglucono-δ-lactone |
| B. | Oxidation of 6-phosphogluconate to ketopentose ribulose 5-phosphate |
| C. | Reduction of 6-phosphoglucono-δ-lactone to glucose 6-phosphate |
| D. | Reduction of ketopentose ribulose 5-phosphate to 6-phosphogluconate |
| Answer» B. Oxidation of 6-phosphogluconate to ketopentose ribulose 5-phosphate | |
| 9. |
In the pentose phosphate pathway, the major products are ____________ |
| A. | Ribulose and NADPH |
| B. | Ribulose and NADH |
| C. | Ribulose and NAD+ |
| D. | Ribulose and ATP |
| Answer» B. Ribulose and NADH | |
| 10. |
THE_USE_OF_NADPH_GENERATED_FROM_PENTOSE_PHOSPHATE_PATHWAY_CANNOT_BE?$ |
| A. | Can be oxidized in the electron transport chain to provide 38 ATPs |
| B. | Used for the synthesis of fatty acids |
| C. | Used for the macrophageal functions |
| D. | Used for steroid synthesis |
| Answer» B. Used for the synthesis of fatty acids | |
| 11. |
Conversion_of_xylulose_5-phosphate_to_ribulose_5-phosphate_is_catalyzed_by$ |
| A. | Phosphopentose epimerase |
| B. | Transaldolase |
| C. | Transketolase |
| D. | Phosphopentose isomerase |
| Answer» B. Transaldolase | |
| 12. |
One of the following statements is correct about pentose phosphate pathway |
| A. | It generates 6 moles of CO<sub>2</sub> for each mole of glucose consumed |
| B. | It generates 38 mol of ATP per mole of glucose consumed |
| C. | It is a reductive pathway that consumes NADH |
| D. | Present in plants but not in animals |
| Answer» B. It generates 38 mol of ATP per mole of glucose consumed | |
| 13. |
The main function of pentose phosphate pathway is |
| A. | Supply NADP<sup>+</sup> |
| B. | Supply NADH |
| C. | Supply energy |
| D. | Supply pentoses and NADPH |
| Answer» E. | |
| 14. |
Oxidation of 3 molecules of glucose by pentose phosphate pathway results in the production of |
| A. | 3 molecules of pentose, 6 molecules of NADPH and 3 molecules of CO<sub>2</sub> |
| B. | 4 molecules of pentose, 6 molecules of NADPH and 3 molecules of CO<sub>2</sub> |
| C. | 4 molecules of pentose, 3 molecules of NADPH and 3 molecules of CO<sub>2</sub> |
| D. | 3 molecules of pentose, 4 molecules of NADPH and 3 molecules of CO<sub>2</sub> |
| Answer» B. 4 molecules of pentose, 6 molecules of NADPH and 3 molecules of CO<sub>2</sub> | |
| 15. |
Which one out of the following enzymes acts in pentose phosphate pathway? |
| A. | Aldolase |
| B. | Glycogen phosphorylase |
| C. | Pyruvate kinase |
| D. | 6-phosphogluconate dehydrogenase |
| Answer» E. | |
| 16. |
Which of the following statements is correct about oxidative pentose phosphate pathway? |
| A. | It generates NADH |
| B. | It oxidizes NADPH to NADP<sup>+</sup> |
| C. | The pathway supplies ribose 5-phosphate and NADPH in the quantities the cell requires |
| D. | Glucose 6-phosphatase catalyzes the rate limiting reaction of the pathway |
| Answer» D. Glucose 6-phosphatase catalyzes the rate limiting reaction of the pathway | |
| 17. |
The first reaction of the pentose phosphate pathway is |
| A. | Oxidation of glucose 6-phosphate to 6-phosphoglucono-δ-lactone |
| B. | Oxidation of 6-phosphogluconate to ketopentose ribulose 5-phosphate |
| C. | Reduction of 6-phosphoglucono-δ-lactone to glucose 6-phosphate |
| D. | Reduction of ketopentose ribulose 5-phosphate to 6-phosphogluconate |
| Answer» B. Oxidation of 6-phosphogluconate to ketopentose ribulose 5-phosphate | |
| 18. |
In the pentose phosphate pathway, the major products are |
| A. | Ribulose and NADPH |
| B. | Ribulose and NADH |
| C. | Ribulose and NAD<sup>+</sup> |
| D. | Ribulose and ATP |
| Answer» B. Ribulose and NADH | |