According to the operon model, for the synthesis of an inducible enzyme to occur, the:.

A sequence of nucleotides in DNA that codes for a functional product. According to the operon model, for the synthesis of an inducible enzyme to occur, the: ... End-product must not be in excess.

Explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds