The availability of tryptophan in the environment is the determining factor for the transcription of structural genes of the trp operon. Thus option C is correct.
The TRP operon regulation of TRP operon system of cell is tryptophan dependent. The mechanism of regulation involved two ways such as repression and mitigation.
Before the initiation of transcription process, the operon mRNA synthesis can be controlled by repressor that inhibit the transcription in presence of tryptophan.
The repressor molecule is 108 amino acid structure with helix-turn-helix domains.
When trp is absent, the repressor will inactive not able to bind with operator leads to transcription of the trp E, D, C, B, A structural genes by binding of RNA polymerase at promoter site.
The opposite activity will occur in presence of trp.
Thus option C is correct.
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Your question was incomplete. So your probable question was
What is the determining factor for the transcription of structural genes of the trp operon?
a. the quantity of trp repressor protein made by the regulatory gene trpr b. the ability of rna polymerase to bind to the promoter region
c. the availability of tryptophan in the environment
d. the location of a regulatory gene with reference to the other regions of the operon
e. the activity of the other operons present in bacteria
