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Biol 1015 Regulation of Gene Expression Review questions
- Course
- BIOL 1015
- Institution
- Prairie View A&M State University
Regulation of Gene Expression Review questions.
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What does the operon model attempt to explain?the coordinated control of gene expression in bacteria
bacterial resistance to antibiotics
how genes move between homologous regions of DNA
the mechanism of viral attachment to a host cell
horizontal transmission of plant viruses
What does the operon model attempt to explain?
the coordinated control of gene expression in bacteria
bacterial resistance to antibiotics
how genes move between homologous regions of DNA
the mechanism of viral attachment to a host cell
horizontal transmission of plant viruses
When tryptophan (an amino acid) is present in the external medium, the E. coli bacterium
brings in tryptophan molecules and does not need to make them. Which of the following
statements about the trp operon is true when there is no tryptophan in the medium?
The repressor is active and binds to the operator.
The repressor is inactive, and RNA polymerase can synthesis mRNA.
The operator is bound, and mRNA is made.
Genes are inactive.
The corepressor binds to the repressor.
When tryptophan (an amino acid) is present in the external medium, the E. coli bacterium
brings in tryptophan molecules and does not need to make them. Which of the following
statements about the trp operon is true when there is no tryptophan in the medium?
The repressor is active and binds to the operator.
The repressor is inactive, and RNA polymerase can synthesis mRNA.
The operator is bound, and mRNA is made.
Genes are inactive.
The corepressor binds to the repressor.
Each of a group of E. coli bacterial cells has a different disabling mutation in its lac operon.
Which of the following will make it impossible for the cell to metabolize lactose?
mutation in lac (-galactosidase gene)
mutation in lac (cannot bind to operator)
mutation in operator (cannot bind to repressor)
mutation in lac (cannot bind to inducer)
Each of a group of E. coli bacterial cells has a different disabling mutation in its lac operon.
Which of the following will make it impossible for the cell to metabolize lactose?
mutation in lac (-galactosidase gene)
mutation in lac (cannot bind to operator)
mutation in operator (cannot bind to repressor)
mutation in lac (cannot bind to inducer)
Which element(s) from the following list is/are part(s) of a bacterial operon?
repressor gene
promoter
inducer
repressor protein
all of the above
, Which element(s) from the following list is/are part(s) of a bacterial operon?
repressor gene
promoter
inducer
repressor protein
all of the above
Which of the following statements about specific transcription factors is false?
The binding of specific transcription factors to the control elements of enhancers
influences the rate of gene expression.
Specific transcription factors include activators and repressors.
myoD gene is an example.
Some act indirectly by affecting chromatin structure.
Interaction of specific transcription factors and RNA polymerase II with a promoter
always leads to a low rate of initiation and production of a few RNA transcripts.
Which of the following statements about specific transcription factors is false?
The binding of specific transcription factors to the control elements of enhancers
influences the rate of gene expression.
Specific transcription factors include activators and repressors.
myoD gene is an example.
Some act indirectly by affecting chromatin structure.
Interaction of specific transcription factors and RNA polymerase II with a
promoter always leads to a low rate of initiation and production of a few RNA
transcripts.
A specific gene is known to code for three different but related proteins. This could be due to
which of the following?
premature mRNA degradation
alternative RNA splicing
use of different enhancers
protein degradation
differential transport
A specific gene is known to code for three different but related proteins. This could be due to
which of the following?
premature mRNA degradation
alternative RNA splicing
use of different enhancers
protein degradation
differential transport
Even though both lens cells and liver cells have numerous transcription factors that are
present in both cells, the lens cell makes the crystallin protein (not albumin), whereas
the liver cell makes albumin (not crystallin). Which of the following explains this cell
specificity?
Different specific transcription factors made in each cell determine which genes are
expressed.
At fertilization, specific cells are destined for certain functions.
The activators needed for expression of the crystallin gene are present in all cells.
The promoters are different for the different genes.
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