MCQOPTIONS
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MCQOPTIONS
This section includes 16 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 one of the following statements about the control of enzyme activity by phosphorylation is correct? |
| A. | Phosphorylation of an enzyme results in a conformational change |
| B. | Phosphorylation of an enzyme occurs only at specific tyrosine residues |
| C. | Phosphorylation of an enzyme is carried out by phosphoprotein phosphatases |
| D. | Enzyme control by phosphorylation is irreversible |
| Answer» B. Phosphorylation of an enzyme occurs only at specific tyrosine residues | |
| 2. |
Which of the following statements is true about brain metabolism in starvation? |
| A. | The brain can use glucogenic amino acids for energy |
| B. | The brain can only use glucose as fuel |
| C. | Up to a quarter of energy requirement of the brain can come from fatty acids |
| D. | Up to a half of energy requirement of the brain can come from ketone bodies |
| Answer» B. The brain can only use glucose as fuel | |
| 3. |
Which of the following type of metabolites is used for generating glucose under severe starvation conditions? |
| A. | Amino acids |
| B. | Fats |
| C. | Glycogen |
| D. | Starch |
| Answer» B. Fats | |
| 4. |
Diminished flow of blood to tissues is termed as ___________ |
| A. | Hypoxia |
| B. | Ischemia |
| C. | Homeostasis |
| D. | Metabolism |
| Answer» C. Homeostasis | |
| 5. |
Diminished delivery of oxygen to tissues is termed as ___________ |
| A. | Hypoxia |
| B. | Ischemia |
| C. | Homeostasis |
| D. | Metabolism |
| Answer» B. Ischemia | |
| 6. |
The rate of breakdown of metabolites is termed as ___________ |
| A. | Metabolic state |
| B. | Metabolism |
| C. | Steady state |
| D. | Homeostasis |
| Answer» D. Homeostasis | |
| 7. |
Which out of the following statements is true about the regulation of metabolic pathway? |
| A. | Most of the metabolic pathways are regulated |
| B. | Most of the metabolic pathways are not regulated |
| C. | Regulation of metabolic pathways always involves changing the amount of enzymes |
| D. | Metabolic regulation always depends on control by hormones |
| Answer» B. Most of the metabolic pathways are not regulated | |
| 8. |
WHICH_OF_THE_FOLLOWING_STATEMENTS_IS_TRUE_ABOUT_BRAIN_METABOLISM_IN_STARVATION??$ |
| A. | The brain can use glucogenic amino acids for energy |
| B. | The brain can only use glucose as fuel |
| C. | Up to a quarter of energy requirement of the brain can come from fatty acids |
| D. | Up to a half of energy requirement of the brain can come from ketone bodies |
| Answer» B. The brain can only use glucose as fuel | |
| 9. |
One_of_the_following_statements_about_the_control_of_enzyme_activity_by_phosphorylation_is_correct |
| A. | Phosphorylation of an enzyme results in conformational change |
| B. | Phosphorylation of an enzyme occurs only at specific tyrosine residues |
| C. | Phosphorylation of an enzyme is carried out by phosphoprotein phosphatases |
| D. | Enzyme control by phosphorylation is irreversible |
| Answer» B. Phosphorylation of an enzyme occurs only at specific tyrosine residues | |
| 10. |
Which of the following type of metabolite is used for generating glucose under severe starvation conditions? |
| A. | Amino acids |
| B. | Fats |
| C. | Glycogen |
| D. | Starch |
| Answer» B. Fats | |
| 11. |
Which of the following is not a factor determining the activity of an enzyme? |
| A. | Association with regulatory protein |
| B. | Sequestration |
| C. | Allosteric regulation |
| D. | Nucleotides |
| Answer» E. | |
| 12. |
Which of the following statements is true about the control of muscle glycogen phosphorylase? |
| A. | It is activated by phosphorylation by an active phosphorylase kinase |
| B. | It is allosterically activated by ATP |
| C. | It is allosterically activated by cAMP |
| D. | Normally it exists in active form |
| Answer» B. It is allosterically activated by ATP | |
| 13. |
Diminished flow of blood to tissues is termed as |
| A. | Hypoxia |
| B. | Ischemia |
| C. | Homeostasis |
| D. | Metabolism |
| Answer» C. Homeostasis | |
| 14. |
Diminished delivery of oxygen to tissues is termed as |
| A. | Hypoxia |
| B. | Ischemia |
| C. | Homeostasis |
| D. | Metabolism |
| Answer» B. Ischemia | |
| 15. |
The rate of breakdown of metabolites is termed as |
| A. | Metabolic state |
| B. | Metabolism |
| C. | Steady state |
| D. | Homeostasis |
| Answer» D. Homeostasis | |
| 16. |
Which out of the following statements is true about regulation of metabolic pathway? |
| A. | Most of the metabolic pathways are regulated |
| B. | Most of the metabolic pathways are not regulated |
| C. | Regulation of metabolic pathways always involves changing the amount of enzymes |
| D. | Metabolic regulation always depends on control by hormones |
| Answer» B. Most of the metabolic pathways are not regulated | |