Concept explainers
(a)
To explain:
The changes in tryptophan synthase activity when the
Introduction:
A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.
(a)
Explanation of Solution
Explanation:
There are one or more regulatory gene outside of the operon that produce trans acting factor such as repressor or activators. The trp operon is a repressible operon, which repress the expression of structural gene in the presences of tryptophan.
The
Conclusion:
The level of tryptophan synthase activity will remain high in the bacterial cell, when the
(b)
To explain:
The changes in tryptophan synthase activity when the
Introduction:
A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.
(b)
Explanation of Solution
Explanation:
The
(c)
To explain:
The changes in tryptophan synthase activity when the
Introduction:
A group of prokaryotic genes with related functions that are regulated as a single unit, along with the control sequence that performs this regulation, is called an operon. Trp-operon have structural gene E, D, C, B and A that are repressed or inactive in the presence of tryptophan.
(c)
Explanation of Solution
Explanation:
An operator is a DNA segment that turns the gene on and off. Its interaction with proteins increases or decrease the rate of transcription from occurring thus make an operon inducible or repressible.
Trp operon is a repressible operon which, repress the transcription of structural gene in the presence of tryptophan. The
Conclusion:
The tryptophan synthase activity will decrease when the
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Chapter 28 Solutions
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