A certain enzyme is synthesized whenever the solution in which some cells are growing lacks substance X.This phenomenon is most likely an example of a(n) _______ system.
A) inducible
B) positive
C) negative
D) repressible
E) positive-negative

Question

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The Answer of A certain enzyme is synthesized whenever the solution in which some cells are growing lacks substance X.This phenomenon is most likely an example of a(n) _______ system.
A) inducible
B) positive
C) negative
D) repressible
E) positive-negative

A Certain Enzyme Is Synthesized Whenever the Solution in Which