MCQOPTIONS
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MCQOPTIONS
This section includes 8 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 type of splicing reaction requires a guanine nucleoside or nucleotide cofactor that is not used as a source of energy? |
| A. | Spliceosomal |
| B. | Group I |
| C. | Group II |
| D. | Group IV |
| Answer» C. Group II | |
| 2. |
The largest class of introns which are found in nuclear mRNA primary transcript is? |
| A. | Spliceosomal introns |
| B. | Group I introns |
| C. | Group II introns |
| D. | Group IV introns |
| Answer» B. Group I introns | |
| 3. |
Which one of the following best describes the cap modification of eukaryotic mRNA? |
| A. | Modified guanine nucleotide added to the 3 end of the transcript |
| B. | Modified guanine nucleotide added to the 5 end of the transcript |
| C. | String of adenine nucleotides added to the 3 end of the transcript |
| D. | String of adenine nucleotides added to the 5 end of the transcript |
| Answer» C. String of adenine nucleotides added to the 3 end of the transcript | |
| 4. |
What is the main function of t-RNA? |
| A. | Proof reading |
| B. | Inhibits protein synthesis |
| C. | Identifies amino acids and transport them to ribosomes |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 5. |
80S eukaryotic ribosome is the complex of ____________ |
| A. | 60S and 40S |
| B. | 40S and 20S |
| C. | 60S and 50S |
| D. | 30S and 20S |
| Answer» B. 40S and 20S | |
| 6. |
70S prokaryotic ribosome is the complex of ____________ |
| A. | 30S + 50S |
| B. | 30S + 40S |
| C. | 20S + 60S |
| D. | 20S + 30S |
| Answer» B. 30S + 40S | |
| 7. |
Which is the first nucleic acid synthesizing enzyme discovered? |
| A. | Polynucleotide phosphorylase |
| B. | DNA polymerase |
| C. | RNA polymerase |
| D. | DNA ligase |
| Answer» B. DNA polymerase | |
| 8. |
Which of the following is an incorrect statement about m-RNA? |
| A. | Cap is added to the 5 end |
| B. | Introns are removed and exons are spliced together |
| C. | Histone mRNAs lack 5 cap |
| D. | Poly-A tail is added to the 3 end |
| Answer» C. Histone mRNAs lack 5 cap | |