GCU BIO 181 FINAL EXAM 4 SPRING SEMESTER TEST QUESTIONS WITH SOLUTIONS
The tryptophan operon is a repressible operon that is:
Turned off whenever tryptophan is added to the growth medium.
The lactose operon is likely to be transcribed when:
The cyclic AMP and lactose levels are both high within the cell.
For a repressible operon to be transcribed, which of the following must occur?
RNA polymerase must bind to the promoter, and the repressor must be inactive.
Which of the following, when taken up by the cell, binds to the repressor so that the
repressor no longer binds to the operator?
Inducer
What is a promoter?
Sequence where the RNA polymerase binds and begins transcription. It is upstream of the
sequence encoding the protein
Which of the following is a protein produced by a regulatory gene?
Repressor
, What is a corepressor?
A small molecule that combines with and activates a repressor produced by a regular gene
What is an operator?
A regulatory sequence that a repressor can bind to
What is a regulatory gene?
Genes that encode a protein involved in regulation of gene expression
What has to happen for a gene to be transcribed?
RNA polymerase, which makes new RNA molecules from a DNA template, must attach to
the DNA of the gene.
In eukaryotes, general transcription factors:
Bind to other proteins or to a sequence element within the promoter called the TATA box.
What is a TATA box?
DNA sequence that indicates where a genetic sequence can be read and decoded
The tryptophan operon is a repressible operon that is:
Turned off whenever tryptophan is added to the growth medium.
The lactose operon is likely to be transcribed when:
The cyclic AMP and lactose levels are both high within the cell.
For a repressible operon to be transcribed, which of the following must occur?
RNA polymerase must bind to the promoter, and the repressor must be inactive.
Which of the following, when taken up by the cell, binds to the repressor so that the
repressor no longer binds to the operator?
Inducer
What is a promoter?
Sequence where the RNA polymerase binds and begins transcription. It is upstream of the
sequence encoding the protein
Which of the following is a protein produced by a regulatory gene?
Repressor
, What is a corepressor?
A small molecule that combines with and activates a repressor produced by a regular gene
What is an operator?
A regulatory sequence that a repressor can bind to
What is a regulatory gene?
Genes that encode a protein involved in regulation of gene expression
What has to happen for a gene to be transcribed?
RNA polymerase, which makes new RNA molecules from a DNA template, must attach to
the DNA of the gene.
In eukaryotes, general transcription factors:
Bind to other proteins or to a sequence element within the promoter called the TATA box.
What is a TATA box?
DNA sequence that indicates where a genetic sequence can be read and decoded
