Question

fill in the blank question

an enzyme present in constant amounts regardless of the presence of substrate is a(n) blank enzyme.

Explanation:

Identify the definition of enzymes based on regulation

An enzyme that is always present in relatively constant amounts regardless of cellular conditions or substrate concentration is defined as a constitutive enzyme.

Contrast with regulated enzymes

In contrast, regulated enzymes are synthesized (induced) or turned off (repressed) in response to changes in concentration of the substrate.

Answer:

An enzyme present in constant amounts regardless of the presence of substrate is a(n) <blank>constitutive</blank> enzyme.