Transcription and Regulation problems
- 1. In prokaryotes, transcription is
Options- A. terminated by the stop codon
- B. terminated by a protein called rho
- C. terminated by a poly A sequence
- D. terminated by a start codon Discuss
Correct Answer: terminated by a protein called rho
- 2. The nucleons of eukaryotic cell has
Options- A. RNA polymerase I
- B. RNA polymerase II
- C. RNA polymerase III
- D. all of these Discuss
Correct Answer: all of these
- 3. Most transcripts of protein coding genes are cleaved
Options- A. at the 3' end just after a poly adenylation signal
- B. at the 3' end just before a poly adenylation signal
- C. at the 5' end immediately after a poly adenylation signal
- D. at the 5' end immediately before a poly adenylation signal Discuss
Correct Answer: at the 3' end just after a poly adenylation signal
- 4. Each tRNA molecule has a cloverleaf secondary structure consisting of
Options- A. three stem loops
- B. two stem loops
- C. four stem loops
- D. either (a) or (b) Discuss
Correct Answer: three stem loops
- 5. The RNA polymerases that transcribe bacterial DNA are
Options- A. multisubunit enzymes
- B. only active inside the cell
- C. interchangable with DNA polymerases
- D. highly glycosylated in their active forms Discuss
Correct Answer: multisubunit enzymes
- 6. Transcription by E. coli polymerase occurs in
Options- A. four phases known as initiation, propagation, elongation and termination
- B. three phases known as initiation, elongation and termination
- C. two phases known as initiation and termination
- D. none of the above Discuss
Correct Answer: three phases known as initiation, elongation and termination
- 7. Multiple copies of 5S genes, located at a chromosomal site distinct from the other rRNA genes
Options- A. are transcribed by rRNA polymerase III and the 5S rRNA
- B. are transcribed by rRNA polymerase II
- C. are transcribed by rRNA polymerase I and the 5S rRNA
- D. are transcribed by DNA polymerase I Discuss
Correct Answer: are transcribed by rRNA polymerase III and the 5S rRNA
- 8. Transcription of each set of rRNA genes by RNA polymerasel produces
Options- A. a single 45S rRNA precursor molecule
- B. a single 5S rRNA precursor molecule
- C. a single 18S rRNA precursor molecule
- D. a single 28S rRNA precursor molecule Discuss
Correct Answer: a single 45S rRNA precursor molecule
- 9. RNA is synthesized on a DNA template in a process called __________ , which utilizes the enzyme __________
Options- A. translation, RNA polymerase
- B. transcription, DNA polymerase
- C. transcription, RNA polymerase
- D. replication, DNA polymerase Discuss
Correct Answer: transcription, RNA polymerase
- 10. Transcription begins
Options- A. at the start codon
- B. upstream from the start codon
- C. downstream from the start codon
- D. none of these Discuss
Correct Answer: upstream from the start codon
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Programming
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