MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
Which element of the ribosome plays a key role in mRNA translation? |
| A. | rRNA of the large subunit |
| B. | Proteins of the large subunit |
| C. | rRNA of the small subunit |
| D. | Proteins of the small subunit |
| Answer» D. Proteins of the small subunit | |
| 2. |
With respect to the composition of the ribosome which of the following is correct? |
| A. | Ribosome is composed of 60S and 30S subunit |
| B. | Eukaryotic ribosome small subunit contains only one 16S rRNA |
| C. | 60S subunit consists of 5S rRNA and 23S rRNA |
| D. | 60S and 40S makes up the 80S ribosome |
| Answer» E. | |
| 3. |
Which one of the following is known as the Kozak sequence? |
| A. | 5’…..CNNAUCG…..3’ |
| B. | 5’…..GNNAUGG…..3’ |
| C. | 5’…..TNNAUGG…..3’ |
| D. | 5’…..GNNAUGC…..3’ |
| Answer» C. 5’…..TNNAUGG…..3’ | |
| 4. |
Eukaryotic mRNA is read in the 3’ to 5’ direction. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
Eukaryotic mRNAs recruit ribosomes using the Shine – Dalgarno sequence. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which part of the ribosome identifies the Shine – Dalgarno sequence? |
| A. | Protein |
| B. | 16S rRNA |
| C. | 23S rRNA |
| D. | 5S rRNA |
| Answer» C. 23S rRNA | |
| 7. |
What was the name of the ribosome binding site? |
| A. | ORF |
| B. | RBS |
| C. | A site |
| D. | Shine – Dalgarno sequence |
| Answer» D. Shine – Dalgarno sequence | |
| 8. |
With respect to polycistronic mRNAs which of the following is wrong? |
| A. | Multiple ORFs |
| B. | Found in eukaryotes |
| C. | Encodes proteins with related functions |
| D. | Multiple polypeptide chain |
| Answer» C. Encodes proteins with related functions | |
| 9. |
With respect to the open reading frame (ORF) which of the following is wrong? |
| A. | Starts at 5’ end |
| B. | ‘AUG’ is the only start codon for both prokaryotes and eukaryotes |
| C. | The start codon defines the reading frame for all the subsequent codons |
| D. | The stop codon is distinct from the ends of the mRNA |
| Answer» C. The start codon defines the reading frame for all the subsequent codons | |
| 10. |
Which of the following is a character of ORF? |
| A. | Contiguous |
| B. | 3 – nucleotide codons |
| C. | Intron |
| D. | Non – overlapping |
| Answer» D. Non – overlapping | |