1.

Operon is a:

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» C.                    Segment of DNA specifying a polypeptide.


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