Synthesis of an inducible enzyme requires select one:
a. corepressor and repressor binding to operator.
b. substrate bound to repressor.
c. repressor alone bound to operator.
d. substrate bound to promoter.

B

Explanation:

Synthesis of an inducible enzyme requires the substrate bound to repressor.

In the synthesis of a specific inducible enzymes, a substrate on which the enzyme acts must bind to the repressor that prevents the synthesis of the inducible enzyme. Example of an inducible enzyme is β-galactosidase in Escherichia coli that degrades lactose and galactose.

The synthesis of β-galactosidase is regulated by a repressor protein, that binds to the region of deoxyribonucleic acid (DNA) that codes for the synthesis of β-galactosidase. If lactose or galactose (substrate) is present, it acts as an inducer which induce the repressor protein from binding to DNA. Hence the enzyme is synthesized

the wires in the toaster turning red and the toast crisping and turning brown

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.