Question

9. Which out of the following is NOT an
example of inducible operon?
a. Lactose operon
b. Histidine operon
c. Arabinose operon
d. Tryptophan operon​

Answer 1

Answer:

tryptophan operon

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Answer 2

d. Tryptophan operon​ is NOT an example of inducible operon.

Inducible operon:

• A quantifiable increase in expression in response to an enhancer, inducer, or positive regulator is known as an inducible operon.
• The primary distinction between inducible and repressible operons is that the former are turned off under typical circumstances, whilst the latter are turned on.
• The operon can be turned on or off by an inducer.
• An illustration of an inducible operon is the lac operon.
• Beta-substrate galactosidase's is lactose, which also activates the lac operon.
• Because the lac operon is typically shut off (repressed), but can be activated in the presence of the inducer allolactose, it is referred to as an inducible operon.

Tryptophan operon​:

• A repressor protein that binds to two tryptophan molecules activates the trp operon.
• This repressor-tryptophan complex binds to the trp operator when tryptophan is abundant.
• The operon is not transcribed because this binding inhibits RNA polymerase from binding.

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