Question

1. Which of the following distinguishes the sequences and function of prokaryotic from eukaryotic promoters?

Only prokaryotic promoters contain conserved sequences

Only eukaryotic promoters contain conserved sequences

Only in eukaryotes are accessory proteins required for binding of RNA polymerase

Only in prokaryotes are accessory proteins required for binding of RNA polymerase

None of the above

Answers (1) and (4)

Answers (2) and (3)

2. Amongst RNAs, which of the following RNA types found in cells are relatively unstable?

mRNA

rRNA

tRNA

snRNA

All are equally unstable

Answers (2) and 3)

Answers (2), (3), and (4)

3. What is relationship between poly (A) tail length and mRNA translation in eukaryotes?

There is no relationship

Poly (A) tails are involved in binding of mRNA to the tRNAs

Long poly (A) tails impart shortened translation to mRNAs

Long poly (A) tails impart lengthened translation to mRNAs

There are no poly (A) tails in eukaryotic mRNAs, they are only in prokaryotic mRNAs

4. Small nuclear RNAs (snRNAs) play a role in which of the following processes?

DNA replication functioning as primers

RNA synthesis functioning as transcription initiation factors

RNA processing functioning as catalysts of intron removal

Translation by linking the mRNA with the ribosome

Addition of the 5’-7-methylguanine (CAP)

5. What is the role of sigma protein in mRNA synthesis in prokaryotes?

Forms the primer for mRNA synthesis

Termination of mRNA synthesis

Binding of RNA polymerase to promoters

Forming stem-loop structures in mRNA

Degradation of mRNA

Protection of mRNA from degradation

None of the above, sigma protein has no role in mRNA synthesis