GCD 3022 Quizzes 5 & 6 Questions With Complete Solutions

GCD 3022 Quizzes 5 & 6 Questions With Complete
Solutions

2-3, continues beyond Correct Answers when tryptophan levels
are low, the ____ step-loop forms and transcription _____ the
trpL gene.

a. 2-3, end just past
b. 2-3, continues beyond
c. 3-4, end just past
d. 3-4, continues beyond

5'-ATTTCGGGTTAA-3' to 5'-ATTTAA-3' Correct Answers
Which of the following does NOT cause a frameshift mutation?

a. 5'-ATTTCGGGTTAA-3' to 5'-ATTTGGTTAA-3'
b. 5'-ATTTCGGGTTAA-3' to 5'-ATTTAA-3'
c. 5'-ATTTCGGGTTAA-3' to 5'-ATTTCTAA-3'
d. 5'-ATTTCGGGTAA-3' to 5'-ATTTTTCGGGTAA-3'

5'-CCAAGGCGUAGGGCCAAUACCGG-3'
3'-GGUUCCGCUACCCGGUUAUGGCC-5' Correct Answers
An mRNA has the following sequence:
5'-...CCAAGGCGAUGGGCCAAUACCGGAAAAAAAAAAA
AAAAA...-3'
Which of the following RNA molecules should achieve the
highest level of gene silencing in eukaryotes?

a. 5'-CCAAGGCGAUGGGCCAAUACCGG-3'
b. 3'-GGUUCCGCUACCCGGUUAUGGCC-5'
c. 5'-GGUUCCGCUACCCGGUUAUGGCC-3'

, 3'-CCAAGGCGAUGGGCCAAUACCGG-3'
d. 5'-CCAAGGCGAUGGGCCAAUACCGG-3'
3'-GGUUCCGCUACCCGGUUAUGGCC-5'

5'-GGAUGGCCUUGAAAAAAAAAAAAAAAAAA-3'
Correct Answers Which of the following mRNAs would be
more stable in eukaryotes?

a. 5'-GGAUGGCCUUGAAAAAAA-3'
b. 5'-GGAUGGCCUUGAAAAAAAAAAAA-3'
c. 5'-GGAUGGCCUUGAAAAAAAAAAAAAAAAAA-3'
d. 5'-GGAUGGCCUUGAAA-3'

5'-TGAC-3'
3'-ACTG-5' Correct Answers A bidirectional enhancer has the
following sequence:
5'-GTCA-3'
3'-CAGT-5'
Which of the following sequences would also be a functional
enhancer?

a. 5'-ACTG-3'
3'-TGAC-5'
b. 3'-GTCA-5'
5'-CATG-3'
c. 5'-TGAC-3'
3'-ACTG-5'
d. 3'-TGAC-5'
5'-ACTG-3'

, 100% Correct Answers Which of the following correctly
estimates the expression level of lac operon in the lacO- mutant
strain which carries an additional copy of the wild type lack
gene and lac operon on F' factor in the absence of lactose?

a. <1%
b. 100%
c. 200%
d. 50%
e. 150%

A group of genes under the control of a single promoter Correct
Answers What is an operon?

a. A site in the DNA where transcription begins
b. A group of genes under the control of a single promoter
c. A sequence in an mRNA which mediates stem-loop formation

A mutation caused by X-rays. Correct Answers Which of the
following is NOT an example of a spontaneous mutation?

a. A mutation caused by depurination.
b. A mutation caused by tautometric shift.
c. A mutation caused by deamination.
d. A mutation caused by X-rays.

A mutation in a sperm cell. Correct Answers Which of the
following is an example of a germline mutation?

a. A mutation in an embryonic muscle cell.
b. A mutation in a sperm cell.