Exam (elaborations)
TEST BANK FOR CAMPBELL BIOLOGY 12TH EDITION || CHAPTERS 18||FULL COMPLETE||LATEST
- Course
- Institution
TEST BANK FOR CAMPBELL BIOLOGY 12TH EDITION || CHAPTERS 18||FULL COMPLETE||LATEST
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Estudyr. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
