Q.

Operon is a

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a

sequence of three nitrogen bases determining a single amino acid.

b

set of closely placed genes regulating a metabolic pathway in prokaryotes.

c

segment of DNA specifying a polypeptide.

d

gene responsible for switching on and switching off other genes.

answer is B.

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Detailed Solution

Operons are segments of genetic material (DNA) which functions as regulated unit or units that can be switched on or switched off. It is a sequence of closely placed genes regulating a metabolic pathway in prokaryotes.

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Operon is a