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11 Dec 2019

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

A. Only prokaryotic promoters contain conserved sequences
B. Only eukaryotic promoters contain conserved sequences
C. Only in eukaryotics are assessory proteins required for binding of RNA polymerase
D. Only in prokaryotes are assessory proteins required for binding of RNA polymerase
E. None of the above
F. Answers (1) and (4)
G. Answers (2) and (3)

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

A. mRNA
B. rRNA
C. tRNA
D. snRNA
E. All are equally unstable
F. Answers (2) and (3)
G. Answers (2), (3), and (4)

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

A. There is no relationship
B. Poly (A) tails are involved in binding of mRNA to the tRNAs
C. Long poly (A) tails impart shortened translation to mRNAs
D. Long poly (A) tails impart lengthened translation to mRNAs
E. 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?

A. DNA replication functioning as primers
B. RNA synthesis function as transcription initiation factors
C. RNA processing functioning as catalysts of intron removal
D. Translation by linking the mRNA with the ribosome
E. Addition of the 5'-7-methylguanine (CAP)

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

A. Forms the primer for mRNA synthesis
B. Termination of mRNA synthesis
C. Binding of RNA polymerase to promoters
D. Forming stem-loop structures in mRNA
E. Degradation of mRNA
F. Protection of mRNA from degradation
G. None of the above, sigma protein has no role in mRNA synthesis

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Keith Leannon
Keith LeannonLv2
13 Dec 2019
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