01
Choose one
1 point
Which statement correctly distinguishes cis-acting regulatory elements from trans-acting regulators?
Free Practice Quiz Question List
8 Gene Regulation Online Quiz Questions
Use this free practice quiz with 20 questions to review 8 Gene Regulation, test your knowledge, and prepare for your next test or exam.
20 questions
02
True or false
1 point
True or false: A promoter is a DNA region where RNA polymerase and associated proteins assemble to begin transcription.
- A
True
- B
False
03
Fill in the blank
1 point
In many prokaryotes, one promoter controls several related genes grouped in an , allowing them to be transcribed into one .
04
Choose one
1 point
A mutation disrupts a DNA region where RNA polymerase and associated proteins normally assemble. Which regulatory element has been affected?
- A
A DNA site that binds a repressor to block transcription
- B
A distant DNA sequence that always decreases transcription
- C
A DNA region where RNA polymerase and associated proteins assemble to begin transcription
- D
A protein that binds an operator and diffuses to other cells
05
Written response
1 point
What molecule binds the Lac repressor and causes it to release the operator when lactose is available? Enter the name of the molecule.
06
True or false
1 point
True or false: When tryptophan accumulates, it can enable the trp repressor to bind the operator and shut down transcription.
- A
True
- B
False
07
Fill in the blank
1 point
At a eukaryotic promoter, help recruit .
08
Choose all
1 point
Select all conditions that together promote the strongest expression of the lac operon.
- A
Lactose is available.
- B
Lactose is absent.
- C
Glucose is scarce.
- D
Glucose is abundant.
09
Written response
1 point
When glucose is scarce, cAMP binds which activator that helps RNA polymerase initiate lac operon transcription? Enter the activator's abbreviation.
10
Choose all
1 point
Select all mechanisms that can contribute to eukaryotic gene regulation, according to the material.
- A
Changes to histones can alter how accessible DNA is.
- B
RNA stability can affect how much protein is ultimately produced.
- C
Eukaryotic genes are generally organized into bacterial-style operons.
- D
Translation can provide a point of regulation after RNA is made.
11
Open ended
1 point
Explain how the lac and trp operons differ in their responses to their respective small molecules, including what happens to transcription when each molecule is available.
12
Choose one
1 point
Which statement best describes how histones relate to gene regulation in eukaryotic cells?
- A
Histones are activator proteins that bind bacterial operators.
- B
DNA is wrapped around histones, and changes to histones or DNA can alter access to genes.
- C
Histones convert RNA into protein after transcription.
- D
Histones are DNA sequences that always silence nearby genes.
13
Choose one
1 point
A eukaryotic gene is regulated by an enhancer located far from the gene. How can the enhancer still influence transcription?
- A
DNA folding can bring a distant enhancer near the promoter it regulates.
- B
Enhancers are always immediately adjacent to the genes they regulate.
- C
Enhancers are proteins that assemble RNA molecules.
- D
Enhancers reduce transcription by blocking RNA polymerase at an operator.
14
True or false
1 point
True or false: DNA methylation reduces gene expression in every context.
- A
True
- B
False
15
Choose one
1 point
A regulatory DNA sequence affects a gene located on the same DNA molecule. A protein that binds that sequence is produced elsewhere in the cell and diffuses to it. Which classification is correct?
- A
The DNA sequence is trans-acting, and the protein is cis-acting.
- B
The DNA sequence is cis-acting, and the protein is trans-acting.
- C
Both the DNA sequence and the protein are cis-acting.
- D
Both the DNA sequence and the protein are trans-acting.
16
Choose one
1 point
A bacterium needs to coordinate expression of several genes with related functions. Which arrangement describes an operon?
- A
Each gene has its own promoter and is transcribed into a separate RNA molecule.
- B
A single operator produces several separate RNA molecules, one for each gene.
- C
A single promoter controls transcription of several genes into one RNA molecule.
- D
A single repressor transcribes several genes into one protein.
17
Choose one
1 point
A bacterium's tryptophan concentration falls. Based on the regulation of the trp operon, what should happen to transcription of the operon's genes?
- A
The operon is transcribed because tryptophan is not available to enable the repressor to bind the operator.
- B
Tryptophan binds the operator and directly recruits RNA polymerase.
- C
The repressor binds tryptophan and releases the operator, increasing transcription.
- D
Low tryptophan raises cAMP, which activates the repressor.
18
Choose one
1 point
Under which conditions is the E. coli lac operon expected to be expressed most strongly?
- A
Lactose absent, glucose scarce
- B
Lactose absent, glucose abundant
- C
Lactose available, glucose abundant
- D
Lactose available, glucose scarce
19
Written response
1 point
DNA is wrapped around what type of protein in chromatin?
20
Written response
1 point
What post-transcriptional process describes how long an RNA molecule persists and can affect how much protein is produced?