What is the lac operon?

Regulation of lac operon

Quiz
•
Biology
•
12th Grade
•
Hard

Siddhanta Chettri
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The lac operon is a genetic system in bacteria that controls the expression of genes involved in lactose metabolism.
The lac operon is a type of protein found in plants.
The lac operon is a structure in animal cells.
The lac operon is a type of virus that infects bacteria.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the three structural genes in the lac operon?
lacZ, lacY, lacA
lacB
lacD
lacC
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which gene in the lac operon encodes for the enzyme beta-galactosidase?
lacZ
lacY
lacA
lacW
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the function of beta-galactosidase in the lac operon?
Promotes the synthesis of lactose
Cleaves lactose into glucose and galactose
Inhibits the breakdown of lactose
Converts glucose into lactose
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of the lac repressor in the regulation of the lac operon?
The lac repressor is only active when lactose is absent.
The lac repressor is involved in translation of the lac operon.
The lac repressor enhances transcription in the presence of lactose.
The lac repressor acts as a negative regulator by blocking transcription in the absence of lactose.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the inducer of the lac operon?
lactose
fructose
sucrose
glucose
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the inducer affect the lac repressor?
The inducer degrades the lac repressor.
The inducer enhances the binding of the lac repressor to the lac operator.
The inducer prevents the lac repressor from binding to the lac operator.
The inducer has no effect on the lac repressor.
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