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Molecular Basis Of Inheritance

Question
CBSEENBI12047440
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Lactose (Lac) operon is regulated by

  • lac repressor only

  • lac repressor and CAP-cGMP complex

  • lac repressor and CAP-cAMP complex

  • CAP-cAMP and CAP-cGMP complex

Solution

C.

lac repressor and CAP-cAMP complex

The lac operon is regulated by lac repressor and CAP cAMP complex. The inducer - repressor control of the lac operon is an example of negative control of lac-operon, in which expression is normally blocked.

CAP-cAMP system is an example of positive control because expression of the lac operon requires the presence of an activating single. In this case, the interaction of the CAP-cAMP complex with the CAP region takes place.

Some More Questions From Molecular Basis of Inheritance Chapter

Name the genetic material for majority of organisms.

List the function of RNA.

List the number of base pairs in :

(i) lambda bacteriophage

(ii) E.coli and

(iii) haploid content of human DNA.

Comment two chains of DNA have antiparallel polarity.

What is the difference between DNAs and DNAase ?

Which was first genetic material ?

Suggest one evidence to prove that RNA was first genetic material.

Why was RNA unstable ?

What made DNA more preferrable as genetic material ?

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