MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 6 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 is false about feedback regulation? |
| A. | It is a type of enzymatic activity regulation |
| B. | The synthesis of concerned enzyme is inhibited by interfering with the gene of that enzyme |
| C. | Concentration of enzyme is reduced by the end product |
| D. | The best example is the biosynthesis of L-isoleucine from L-threonine in bacteria |
| Answer» E. | |
| 2. |
Which of the following enzyme catalyzes a reaction that introduces reduced nitrogen ito cellular metabolism? |
| A. | Bacterial glutamine synthase |
| B. | Bacterial dinitrogenase reductase |
| C. | Bacterial dinitrogenase oxidase |
| D. | Phosphatase |
| Answer» B. Bacterial dinitrogenase reductase | |
| 3. |
Which of the following takes place due to phosphorylation of isocitrate dehydrogenase? |
| A. | Inhibits the binding of citrate at active site |
| B. | Degrades the enzyme |
| C. | Enhances the substrate-binding affinity |
| D. | No reaction |
| Answer» B. Degrades the enzyme | |
| 4. |
The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ___________ |
| A. | Diphteria toxin and cholera toxin |
| B. | Dinitrogenase reductase |
| C. | Protein phosphatases |
| D. | Protein kinases |
| Answer» E. | |
| 5. |
Removal of phosphoryl groups is catalyzed by ___________ |
| A. | Diphteria toxin and cholera toxin |
| B. | Dinitrogenase reductase |
| C. | Protein phosphatases |
| D. | Protein kinases |
| Answer» D. Protein kinases | |
| 6. |
The allosteric inhibitor of an enzyme ___________ |
| A. | Causes the enzyme to work faster |
| B. | Binds to the active site |
| C. | Participates in feedback regulation |
| D. | Denatures the enzyme |
| Answer» D. Denatures the enzyme | |