Multiple Choice
Which of the following statements is FALSE?
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16. Regulation of Expression
Review of the Lac Operon & Trp Operon
Multiple Choice
Which of the following statements is TRUE?
A
Lac I is the inducer molecule for the lac operon.
B
Tryptophan is an inducer molecule for the trp operon.
C
In the presence of lactose, the lac operon is expressed.
D
In the presence of tryptophan, the trp operon is expressed.
Verified step by step guidance1
Understand the concept of operons: Operons are clusters of genes regulated together, typically found in prokaryotes. The lac operon and trp operon are classic examples used to study gene regulation.
Learn about the lac operon: The lac operon is involved in the metabolism of lactose in E. coli. It is regulated by the presence or absence of lactose, which acts as an inducer molecule.
Explore the role of lactose in the lac operon: When lactose is present, it binds to the repressor protein, causing it to detach from the operator region, allowing transcription of the lac operon genes.
Understand the trp operon mechanism: The trp operon is responsible for the synthesis of tryptophan. It is regulated by the presence of tryptophan, which acts as a corepressor, binding to the repressor protein and enabling it to attach to the operator, thus inhibiting transcription.
Evaluate the statements: Based on the understanding of the lac and trp operons, identify that the statement 'In the presence of lactose, the lac operon is expressed' is true, as lactose induces the expression of the lac operon.
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