MCQOPTIONS
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MCQOPTIONS
This section includes 12 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 about mRNA stability is not correct? |
| A. | Regulation of mRNA stability is a way of regulating gene expression |
| B. | Prokaryotic mRNAs have a half-life of only a few minutes |
| C. | Histone mRNAs have especially long poly-A tails and are stable |
| D. | It is thought that poly-A tails stabilize eukaryotic mRNAs |
| Answer» D. It is thought that poly-A tails stabilize eukaryotic mRNAs | |
| 2. |
RNAi stands for ____________ |
| A. | RNA inducer |
| B. | RNA interference |
| C. | RNA intron |
| D. | RNA insertion |
| Answer» C. RNA intron | |
| 3. |
The mechanism by which CBP activates transcription is? |
| A. | CBP has DNA methyl transferase activity |
| B. | CBP has histone acetyl transferase activity |
| C. | CBP interacts with the basal transcription complex |
| D. | CBP interacts with the basal transcription complex and has histone acetyl transferase activity |
| Answer» D. CBP interacts with the basal transcription complex and has histone acetyl transferase activity | |
| 4. |
WHICH_OF_THE_FOLLOWING_ABOUT_MRNA_STABILITY_IS_NOT_CORRECT??$ |
| A. | Regulation of mRNA stability is a way of regulating gene expression |
| B. | Prokaryotic mRNAs have a half-life of only a few minutes |
| C. | Histone mRNAs have especially long poly-A tails and are stable |
| D. | It is thought that poly-A tails stabilize eukaryotic mRNAs |
| Answer» D. It is thought that poly-A tails stabilize eukaryotic mRNAs | |
| 5. |
RNAI_STANDS_FOR?$ |
| A. | RNA inducer |
| B. | RNA interference |
| C. | RNA intron |
| D. | RNA insertion |
| Answer» C. RNA intron | |
| 6. |
The mechanism by which CBP activates transcription i? |
| A. | CBP has DNA methyl transferase activity |
| B. | CBP has histone acetyl transferase activity |
| C. | CBP interacts with the basal transcription complex |
| D. | CBP interacts with the basal transcription complex and has histone acetyl transferase activity |
| Answer» D. CBP interacts with the basal transcription complex and has histone acetyl transferase activity | |
| 7. |
Which of the following increases gene expression as much as 200-fold? |
| A. | TATA box |
| B. | Insulator |
| C. | Enhancer |
| D. | CAAT box |
| Answer» D. CAAT box | |
| 8. |
Which of the following statements regarding the regulation of trp operon expression by attenuation is correct? |
| A. | Rapid translation of the leader peptide prevents completion of mRNA transcript |
| B. | Rapid translation of the leader peptide allows completion of mRNA transcript |
| C. | The leader peptide sequence encodes enzymes required for tryptophan synthesis |
| D. | The leader peptide sequence contains no tryptophan residues |
| Answer» B. Rapid translation of the leader peptide allows completion of mRNA transcript | |
| 9. |
Which of the following statements about lac operon in e.coli is true? |
| A. | Promoter is the binding site for the lac repressor |
| B. | Operon is only switched on in the absence of lactose in the growth medium |
| C. | β-galactosidase is only produced in large quantities when the lac repressor is bound to the operator |
| D. | Lac operon mRNA is a polycistronic mRNA |
| Answer» E. | |
| 10. |
To which class of transcription factor do nuclear receptors belong? |
| A. | Zinc finger proteins |
| B. | Leucine zipper proteins |
| C. | Helix-turn-helix proteins |
| D. | Helix-loop-helix proteins |
| Answer» B. Leucine zipper proteins | |
| 11. |
Which of the following is the most appropriate definition of an operator? |
| A. | A non-coding, regulatory DNA sequence that is bound by RNA polymerase |
| B. | A non-coding, regulatory DNA sequence that is bound by a repressor protein |
| C. | A DNA-binding protein that regulates gene expression |
| D. | A cluster of genes that are regulated by a single promoter |
| Answer» C. A DNA-binding protein that regulates gene expression | |
| 12. |
Which of the following bacterial operon is not controlled by attenuation? |
| A. | Arabinose |
| B. | Tryptophan |
| C. | Leucine |
| D. | Histidine |
| Answer» B. Tryptophan | |