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 out of the following is not an example of an inducible operon? |
| A. | Lactose operon |
| B. | Galactose operon |
| C. | Maltose operon |
| D. | Tryptophan operon |
| Answer» E. | |
| 2. |
Which of the following is not required for the expression of genes in the lactose operon? |
| A. | lacl gene product |
| B. | cAMP |
| C. | Allolactose |
| D. | Adenylate cyclase |
| Answer» B. cAMP | |
| 3. |
If lactose and glucose are provided in the growth medium of a culture of E. coli ____________ |
| A. | Lactose operon is not transcribed |
| B. | Lactose metabolism is favored |
| C. | Both lactose and glucose are metabolized at same rate |
| D. | Adenylate cyclase is activated |
| Answer» B. Lactose metabolism is favored | |
| 4. |
Lac repressor dissociates from its operator when the repressor binds to ____________ |
| A. | Heat shock module |
| B. | Promoter |
| C. | Inducer |
| D. | Catabolite activator site |
| Answer» D. Catabolite activator site | |
| 5. |
The lactose repressor is encoded by ____________ |
| A. | Lac-l |
| B. | Lac-A |
| C. | Lac-Y |
| D. | Lac-Z |
| Answer» B. Lac-A | |
| 6. |
Lactose utilization by E. coli requires ____________ |
| A. | Lac-Z |
| B. | Lac-A |
| C. | Lac-Y |
| D. | Lac-l |
| Answer» D. Lac-l | |
| 7. |
WHICH_OF_THE_FOLLOWING_IS_NOT_REQUIRED_FOR_THE_EXPRESSION_OF_GENES_IN_THE_LACTOSE_OPERON??$ |
| A. | lacl gene product |
| B. | cAMP |
| C. | Allolactose |
| D. | Adenylate cyclase |
| Answer» B. cAMP | |
| 8. |
Which_out_of_the_following_is_not_an_example_of_inducible_operon?$ |
| A. | Lactose operon |
| B. | Galactose operon |
| C. | Maltose operon |
| D. | Tryptophan operon |
| Answer» E. | |
| 9. |
If lactose and glucose are provided in the growth medium of a culture of E. col? |
| A. | Lactose operon is not transcribed |
| B. | Lactose metabolism is favored |
| C. | Both lactose and glucose are metabolized at same rate |
| D. | Adenylate cyclase is activated |
| Answer» B. Lactose metabolism is favored | |
| 10. |
Which of the following are the structural motifs that mediate protein-protein interactions? |
| A. | Leucine zipper and basic helix-loop-helix |
| B. | Homeodomain |
| C. | Zinc finger |
| D. | Helix-turn-helix |
| Answer» B. Homeodomain | |
| 11. |
The lac repressor has which of the following DNA-binding motif? |
| A. | Helix-turn-helix |
| B. | Zinc finger |
| C. | Homeodomain |
| D. | Leucine zipper |
| Answer» B. Zinc finger | |
| 12. |
Lac repressor dissociates from its operator when the repressor binds to |
| A. | Heat shock module |
| B. | Promoter |
| C. | Inducer |
| D. | Catabolite activator site |
| Answer» D. Catabolite activator site | |
| 13. |
Where does a repressor bind an operon? |
| A. | Operator |
| B. | Promoter |
| C. | Inducer |
| D. | Catabolite activator site |
| Answer» B. Promoter | |
| 14. |
The lactose repressor is encoded by |
| A. | Lac-l |
| B. | Lac-A |
| C. | Lac-Y |
| D. | Lac-Z |
| Answer» B. Lac-A | |
| 15. |
Lactose utilization by E. coli requires |
| A. | Lac-Z |
| B. | Lac-A |
| C. | Lac-Y |
| D. | Lac-l |
| Answer» D. Lac-l | |
| 16. |
Which of the following is not an example of housekeeping genes? |
| A. | RNA polymerase |
| B. | r-RNA genes |
| C. | Beta galactosidase |
| D. | Enzymes required for basic metabolic pathways common to most cells |
| Answer» D. Enzymes required for basic metabolic pathways common to most cells | |