MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The active form of glycogen phosphorylase is phosphorylated, while the dephosphorylation of which active form occurs? |
| A. | Glycogen synthase |
| B. | Glycogen semisynthase |
| C. | Glycogen hydrolase |
| D. | Glycogen dehydrogenase |
| Answer» B. Glycogen semisynthase | |
| 2. |
Glucose from the breakdown of glycogen is obtained in |
| A. | the liver by phosphorolysis |
| B. | the muscles by phosphorolysis |
| C. | the muscles by hydrolysis |
| D. | both (a) and (b) |
| Answer» E. | |
| 3. |
Glycogen has |
| A. | α-1,4 linkage |
| B. | α-1,6 linkages |
| C. | α-1,4 and α-1,6 linkages |
| D. | α-1,4 and β-1,6 linkage |
| Answer» D. α-1,4 and β-1,6 linkage | |
| 4. |
The released energy obtained by oxidation of glucose is stored as |
| A. | a concentration gradient across a membrane |
| B. | ADP |
| C. | ATP |
| D. | NAD+ |
| Answer» D. NAD+ | |
| 5. |
The enzymes of glycolysis in a eukaryotic cell are located in the |
| A. | intermembrane space |
| B. | plasma membrane |
| C. | cytosol |
| D. | mitochondrial matrix |
| Answer» D. mitochondrial matrix | |
| 6. |
Which of the following is not true of glycolysis? |
| A. | ADP is phosphorylated to ATP via substrate level phosphorylation |
| B. | The pathway does not require oxygen |
| C. | The pathway oxidizes two moles of NADH to NAD+ for each mole of glucose that enters |
| D. | The pathway requires two moles of ATP to get started catabo-lizing each mole of glucose |
| Answer» D. The pathway requires two moles of ATP to get started catabo-lizing each mole of glucose | |
| 7. |
For every one molecule of sugar glucose which is oxidized __________ molecule of pyruvic acid are produced. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 8. |
The amount of energy received from one ATP is |
| A. | 76 kcal |
| B. | 7.3 kcal |
| C. | 760 kcal |
| D. | 1000 kcal |
| Answer» C. 760 kcal | |
| 9. |
Glycolysis converts ___________ |
| A. | Glucose into pyruvate |
| B. | Glucose into phosphoenolpyruvate |
| C. | Fructose into pyruvate |
| D. | Fructose into phosphoenolpyruvate |
| Answer» B. Glucose into phosphoenolpyruvate | |
| 10. |
The product formed in the first substrate level phosphorylation in glycolysis is ___________ |
| A. | Pyruvate |
| B. | 3-phosphoglycerate |
| C. | 1, 3-bisphosphoglycerate |
| D. | 2-phosphoglycerate |
| Answer» C. 1, 3-bisphosphoglycerate | |
| 11. |
High concentration of glucose 6-phosphate is inhibitory to ___________ |
| A. | Hexokinase |
| B. | Pyruvate kinase |
| C. | Glucokinase |
| D. | Phosphofructokinase-1 |
| Answer» B. Pyruvate kinase | |
| 12. |
Which substrate is used in the last step of glycolysis? |
| A. | Glyceraldehyde 3-phosphate |
| B. | Pyruvate |
| C. | Phosphoenolpyruvate |
| D. | 1, 3-bisphosphoglycerate |
| Answer» D. 1, 3-bisphosphoglycerate | |
| 13. |
What is the first step in the payoff phase of glycolysis? |
| A. | Reduction of 1, 3-bisphosphoglycerate to glyceraldehyde 3-phosphate |
| B. | Oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate |
| C. | Reversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate |
| D. | Irreversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate |
| Answer» C. Reversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate | |
| 14. |
Dihydroxyacetone phosphate is rapidly and reversibly converted to ___________ |
| A. | Glyceraldehyde 3-phosphate |
| B. | 1, 3-bis-phosphoglycerate |
| C. | Fructose 1, 6-bisphosphate |
| D. | Fructose 6-phosphate |
| Answer» B. 1, 3-bis-phosphoglycerate | |
| 15. |
Cleavage of Fructose 1, 6-biophosphate yields ___________ |
| A. | Two aldoses |
| B. | Two ketoses |
| C. | An aldose and a ketose |
| D. | Only a ketose |
| Answer» D. Only a ketose | |
| 16. |
Whenever the cell’s ATP supply is depleted, which of the following enzyme’s activity is increased? |
| A. | Hexokinase |
| B. | Pyruvate kinase |
| C. | Glucokinase |
| D. | Phosphofructokinase-1 |
| Answer» E. | |
| 17. |
What is the general term used for the anaerobic degradation of glucose to obtain energy? |
| A. | Anabolism |
| B. | Oxidation |
| C. | Fermentation |
| D. | Metabolism |
| Answer» D. Metabolism | |
| 18. |
THE_PRODUCT_FORMED_IN_THE_FIRST_SUBSTRATE_LEVEL_PHOSPHORYLATION_IN_GLYCOLYSIS_IS?$ |
| A. | Pyruvate |
| B. | 3-phosphoglycerate |
| C. | 1, 3-bisphosphoglycerate |
| D. | 2-phosphoglycerate |
| Answer» C. 1, 3-bisphosphoglycerate | |
| 19. |
Glycolysis_converts$ |
| A. | Glucose into pyruvate |
| B. | Glucose into phosphoenolpyruvate |
| C. | Fructose into pyruvate |
| D. | Fructose into phosphoenolpyruvate |
| Answer» B. Glucose into phosphoenolpyruvate | |
| 20. |
High concentration of glucose 6-phosphate is inhibitory t |
| A. | Hexokinase |
| B. | Pyruvate kinase |
| C. | Glucokinase |
| D. | Phosphofructokinase-1 |
| Answer» B. Pyruvate kinase | |
| 21. |
The substrate used in the last step of glycolysis is |
| A. | Glyceraldehyde 3-phosphate |
| B. | Pyruvate |
| C. | Phosphoenolpyruvate |
| D. | 1, 3-bisphosphoglycerate |
| Answer» D. 1, 3-bisphosphoglycerate | |
| 22. |
The first step in the payoff phase of glycolysis is |
| A. | Reduction of 1, 3-bisphosphoglycerate to glyceraldehyde 3-phosphate |
| B. | Oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate |
| C. | Reversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate |
| D. | Irreversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate |
| Answer» C. Reversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate | |
| 23. |
Dihydroxyacetone phosphate is rapidly and reversibly converted to |
| A. | Glyceraldehyde 3-phosphate |
| B. | 1, 3-bis-phosphoglycerate |
| C. | Fructose 1, 6-bisphosphate |
| D. | Fructose 6-phosphate |
| Answer» B. 1, 3-bis-phosphoglycerate | |
| 24. |
Cleavage of Fructose 1, 6-biophosphate yields |
| A. | Two aldoses |
| B. | Two ketoses |
| C. | An aldose and a ketose |
| D. | Only a ketose |
| Answer» D. Only a ketose | |
| 25. |
Whenever the cell’s ATP supply is depleted, which of the following enzyme’s activity is increased?$ |
| A. | Hexokinase |
| B. | Pyruvate kinase |
| C. | Glucokinase |
| D. | Phosphofructokinase-1 |
| Answer» E. | |
| 26. |
The general term used for the anaerobic degradation of glucose to obtain energy is |
| A. | Anabolism |
| B. | Oxidation |
| C. | Fermentation |
| D. | Metabolism |
| Answer» D. Metabolism | |
| 27. |
Which of the following enzyme catalyzes the first step of glycolysis? |
| A. | Hexokinase |
| B. | Pyruvate kinase |
| C. | Glucokinase |
| D. | Phosphofructokinase-1 |
| Answer» B. Pyruvate kinase | |