Repressible enzyme are formed

In the absence of corepressor

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In the presence of corepressor

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In the presence of aporepressor

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All of the above

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Solution

The correct option is D In the presence of corepressor
The enzymes and their synthesis are ceased when the concentration of their product becomes high. Such enzymes are called repressible enzymes and the end product is called as a corepressor. Whereas aporepressor is produced by regulator gene which unites with corepressor to form a functional repressor molecule. This repressor molecule inhibits mRNA synthesis by all genes specifying enzymes.

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Similar questions

Q. Study the reaction given below:

In absence of any enzyme this reaction is very slow, with 200 molecules of

H_{2} C O_{3}

being formed in an hour. In presence of enzyme the reaction speeds up dramatically with about 600,000 molecules formed every second. Name the enzyme which has accelerated up the reaction by 10 million times.

Q. Study the reaction given below:

In absence of any enzyme this reaction is very slow, with 200 molecules of

H_{2} C O_{3}

Q. Repressible operon system is usually found in (i) pathways. The pathway’s end product serves as a (ii) to activate the repressor, turn off enzyme synthesis and prevent overproduction of the end product of the pathway. Genes for this operon are usually switched (iii) and the repressor is synthesized in an (iv) form.

A plant cell can be identified from an animal cell by the :
(a) absence of centrosome.
(b) presence of cell membrane.
(c) presence of vacuoles
(d) none of the above

Q. Repressible enzymes are formed ________________.

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