
lecture 20
Authored by ghalia elhayawan
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of a repressor in gene expression?
It activates transcription.
It inhibits transcription.
It recruits RNA polymerase.
It binds to the promoter.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the function of an activator in gene expression?
It inhibits transcription.
It binds to the operator.
It induces transcription.
It dissociates from DNA.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary reason the metabolism of lactose needs to be regulated in cells?
Lactose is the only sugar available.
Breakdown of lactose requires a dedicated enzyme, which is wasteful to produce if not needed.
Lactose is easier to break down than glucose.
Lactose does not require any enzymes for breakdown.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which enzyme is specifically required for the breakdown of lactose?
Lactase
β-galactosidase
Amylase
Sucrase
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the context of the lac operon, what role does lactose play in E. coli?
It acts as a repressor.
It is imported into the cell and used as a carbon source.
It is exported out of the cell.
It inhibits the production of glucose.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Where on this slide is a (β1-4) bond?
Between glucose and galactose in lactose
Between glucose and fructose in sucrose
Between two glucose molecules in maltose
Between two galactose molecules in lactose
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is an operon?
A group of genes regulated together
A single gene expressed independently
A type of RNA molecule
A protein that binds to DNA
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