GCD 3022 QUIZZES 5 & 6 QUESTIONS
WITH 100% VERIFIED ANSWERS
\.Which of the following conditions would cause transcription to be
activated?
a. A repressor plus an inducer
b. A repressor plus a corepressor
c. An activator plus an inhibitor - ANSWERS-A repressor plus an inducer
\.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 -
ANSWERS-A group of genes under the control of a single promoter
\.The binding of ______ is the lac repressor disables the lac repressor to
bind to the ____ site, thereby ____ transcription.
,a. glucose, CAP, and inhibiting
b. allolactose, operator, and increasing
c. glucose, CAP, and increasing
d. allolactose, operator, and inhibiting - ANSWERS-allolactose, operator,
and increasing
\.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 - ANSWERS-2-3, continues beyond
\.Translation can be regulated by:
a. translational repressors
b. attenuation
c. antisense RNA
d. both a and c - ANSWERS-Translational Repressors & Antisense RNA
, \.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% - ANSWERS-100%
\.A mutation changes the first of the 2 top codons to a stop codon
within the trpL gene of the trp operon. How would this affect
attenuation in the presence and absence of tryptophan?
a. Attenuation would occur regardless of tryptophan availability.
b. Attenuation would no longer occur regardless of tryptophan
availability.
c. Attenuation would occur only in the absence of tryptophan.
d. attenuation would occur only in the pretense of tryptophan much like
seen in the wild type cells. - ANSWERS-Attenuation would no longer
occur regardless of tryptophan availability.
WITH 100% VERIFIED ANSWERS
\.Which of the following conditions would cause transcription to be
activated?
a. A repressor plus an inducer
b. A repressor plus a corepressor
c. An activator plus an inhibitor - ANSWERS-A repressor plus an inducer
\.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 -
ANSWERS-A group of genes under the control of a single promoter
\.The binding of ______ is the lac repressor disables the lac repressor to
bind to the ____ site, thereby ____ transcription.
,a. glucose, CAP, and inhibiting
b. allolactose, operator, and increasing
c. glucose, CAP, and increasing
d. allolactose, operator, and inhibiting - ANSWERS-allolactose, operator,
and increasing
\.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 - ANSWERS-2-3, continues beyond
\.Translation can be regulated by:
a. translational repressors
b. attenuation
c. antisense RNA
d. both a and c - ANSWERS-Translational Repressors & Antisense RNA
, \.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% - ANSWERS-100%
\.A mutation changes the first of the 2 top codons to a stop codon
within the trpL gene of the trp operon. How would this affect
attenuation in the presence and absence of tryptophan?
a. Attenuation would occur regardless of tryptophan availability.
b. Attenuation would no longer occur regardless of tryptophan
availability.
c. Attenuation would occur only in the absence of tryptophan.
d. attenuation would occur only in the pretense of tryptophan much like
seen in the wild type cells. - ANSWERS-Attenuation would no longer
occur regardless of tryptophan availability.
