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TEST BANK FOR CAMPBELL BIOLOGY 12TH EDITION || CHAPTERS 18||FULL COMPLETE||LATEST
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TEST BANK FOR CAMPBELL BIOLOGY 12TH EDITION || CHAPTERS 18||FULL COMPLETE||LATEST
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ESTUDYTEST BANK FOR CAMPBELL BIOLOGY 12TH EDITION
|| CHAPTERS 18||FULL COMPLETE||LATEST
1) What is the role of the "operator" in gene regulation?
a. A region of DNA that enhances RNA polymerase activity
b. A region of DNA that controls RNA polymerase’s access to genes
c. A protein that binds to DNA to initiate transcription
d. A region of DNA that signals for the end of transcription
**Answer**: b. A region of DNA that controls RNA polymerase’s access to genes
2) An "operon" consists of:
a. A promoter, an operator, and one or more genes
b. A ribosome and RNA
c. A protein and an enzyme
d. A single gene for regulating DNA replication
**Answer**: a. A promoter, an operator, and one or more genes
3) What does a "repressor" protein do?
a. Increases transcription by binding to RNA
b. Binds to an operator to block RNA polymerase from starting transcription
c. Increases the rate of protein production
d. Stimulates the ribosome to start translation
**Answer**: b. Binds to an operator to block RNA polymerase from starting transcription
4) What is a "regulatory gene"?
a. A gene that directly controls protein synthesis
, ESTUDY
b. A gene that produces a repressor protein to inhibit an operator
c. A gene that speeds up transcription
d. A gene that enhances the function of ribosomes
**Answer**: b. A gene that produces a repressor protein to inhibit an operator
5) What is a "corepressor"?
a. A molecule that helps RNA polymerase bind to DNA
b. A molecule that works with a repressor to turn off an operon
c. A protein that stimulates gene expression
d. A molecule that helps unwind DNA
**Answer**: b. A molecule that works with a repressor to turn off an operon
6) In a "repressible operon," transcription is usually:
a. Off, but can be turned on
b. On, but can be turned off when a specific molecule binds to a repressor
c. Inactive at all times
d. Only active when DNA is fully methylated
**Answer**: b. On, but can be turned off when a specific molecule binds to a repressor
7) What happens in an "inducible operon"?
a. Transcription is usually off, but can be stimulated by a specific molecule
b. Transcription is always active
c. Transcription only occurs under stress conditions
d. RNA is produced in the presence of a corepressor
**Answer**: a. Transcription is usually off, but can be stimulated by a specific molecule
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