MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Molecular Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The shorter half life of mRNAs is essential for the cells environmental adaptation in prokaryotes. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Which of the following is not a step to degrade mRNA? |
| A. | Deadenylation |
| B. | 5’→3’ exonuclease activity |
| C. | 3’→5’ exonuclease activity |
| D. | Site-specific degradation |
| Answer» E. | |
| 3. |
Which of the following types of RNA is the most stable? |
| A. | mRNA |
| B. | hnRNA |
| C. | tRNA |
| D. | snRNA |
| Answer» D. snRNA | |
| 4. |
Presence of premature stop codon triggers nonstop mediated decay. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
Nonsense mediated mRNA decay is proceeded due to the ____________ |
| A. | Absence of tailing |
| B. | Absence of capping |
| C. | Absence of stop codon |
| D. | Absence of ORF |
| Answer» E. | |
| 6. |
WHICH_OF_THE_FOLLOWING_TYPES_OF_RNA_IS_THE_MOST_STABLE??$ |
| A. | mRNA |
| B. | hnRNA |
| C. | tRNA |
| D. | snRNA |
| Answer» D. snRNA | |
| 7. |
The shorter half life of mRNAs is essential for the cells environmental adaptation in prokaryotes.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
Which of the following is not a step to degrade mRNA?$ |
| A. | Deadenylation |
| B. | 5’→3’ exonuclease activity |
| C. | 3’→5’ exonuclease activity |
| D. | Site-specific degradation |
| Answer» E. | |
| 9. |
mRNA for which of the following has a longer half life? |
| A. | SSB protein |
| B. | Polymerase |
| C. | G protein |
| D. | Nucleases |
| Answer» D. Nucleases | |
| 10. |
The half life of mRNA of both prokaryotic and eukaryotic cells is same. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
Presence of premature stop codon triggers nonstop mediated decay? |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
Nonsense mediated mRNA decay is proceeded due to the ___________? |
| A. | Absence of tailing |
| B. | Absence of capping |
| C. | Absence of stop codon |
| D. | Absence of ORF |
| Answer» E. | |
| 13. |
How many ways of RNA degradation are found in eukaryotic cell? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 14. |
The introns are degraded due to ____________ |
| A. | Specific enzymatic sequence |
| B. | Unprotected ends |
| C. | Lariat formation |
| D. | Endonuclease activity |
| Answer» C. Lariat formation | |
| 15. |
The enzyme that degrades the mRNA recognizes ____________ bond of mRNA. |
| A. | 2’ – 5’ |
| B. | 2’ – 3’ |
| C. | 2’ – 5’ |
| D. | 3’ – 5’ |
| Answer» B. 2‚Äö√Ñ√∂‚àö√ë‚àö¬• ‚Äö√Ñ√∂‚àö√ë‚àö¬® 3‚Äö√Ñ√∂‚àö√ë‚àö¬• | |
| 16. |
Introns makes up about ____________ % of the total mRNA. |
| A. | 50 |
| B. | 70 |
| C. | 90 |
| D. | 80 |
| Answer» D. 80 | |
| 17. |
Translation of an mRNA is the only way to proofread mRNAs. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
Ski7 is known to recruit ____________ enzyme for mRNA degradation. |
| A. | Endonuclease |
| B. | 3’→5’ exonuclease |
| C. | 5’→3’ exonuclease |
| D. | Nuclease |
| Answer» C. 5‚Äö√Ñ√∂‚àö√ë‚àö¬•‚Äö√Ñ√∂‚àö√∫‚àö‚â†3‚Äö√Ñ√∂‚àö√ë‚àö¬• exonuclease | |
| 19. |
Nonstop mediated decay is observed mostly in ____________ |
| A. | Bacteria |
| B. | Fungi |
| C. | Protozoa |
| D. | Animal |
| Answer» E. | |