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Biology 1107
Test Description: Chapter 18 Practice Questions
Instructions: Answer all questions to get your test result.
1) What does the operon model attempt to explain?
A
the mechanism of viral attachment to a host cell
B
bacterial resistance to antibiotics
C
how genes move between homologous regions of DNA
D
the coordinated control of gene expression in bacteria
2) This protein is produced by a regulatory gene:
A
Operon
B
Inducer
C
Repressor
D
Promoter
3) A mutation in this section of DNA could influence the binding of RNA polymerase to the DNA:
A
Corepressor
B
Inducer
C
Operon
D
Promoter
4) A lack of this nonprotein molecule would result in the inability of the cell to \
A
Repressor
B
Inducer
C
Corepressor
D
Operon
5) When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator:
A
Operon
B
Repressor
C
Inducer
D
Promoter
6) A mutation that inactivates the regulatory gene of a repressible operon in an E. coli cell would result in
A
continuous transcription of the structural gene controlled by that regulator.
B
irreversible binding of the repressor to the operator.
C
inactivation of RNA polymerase by alteration of its active site.
D
complete inhibition of transcription of the structural gene controlled by that regulator.
7) The lactose operon is likely to be transcribed when
A
the cyclic AMP levels are low.
B
the cyclic AMP and lactose levels are both high within the cell.
C
there is more glucose in the cell than lactose.
D
there is glucose but no lactose in the cell.
8) Transcription of the structural genes in an inducible operon
A
starts when the pathway\'s product is present.
B
starts when the pathway\'s substrate is present.
C
does not result in the production of enzymes.
D
occurs continuously in the cell.
9) For a repressible operon to be transcribed, which of the following must occur?
A
RNA polymerase must bind to the promoter, and the repressor must be inactive.
B
RNA polymerase cannot be present, and the repressor must be inactive.
C
RNA polymerase and the active repressor must be present.
D
A corepressor must be present.
10) Altering patterns of gene expression in prokaryotes would most likely serve the organism\'s survival in which of the following ways?
A
allowing young organisms to respond differently from more mature organisms
B
allowing the organism to adjust to changes in environmental conditions
C
organizing gene expression so that genes are expressed in a given order
D
allowing each gene to be expressed an equal number of times
*select an answer for all questions
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