Enzymes that are involved in the feedback inhibition are known as

The correct option is Allosteric enzymes.

To understand why this is the correct answer, let's break down the concepts step-by-step:

1. What is Feedback Inhibition?
Feedback inhibition is a cellular control mechanism in which the final product of a metabolic pathway inhibits an enzyme that acts earlier in the pathway. This prevents the cell from wasting resources by making more of a product than it needs. When the concentration of the end-product builds up, it binds to the regulatory site of the key enzyme to temporarily shut down the pathway.

2. What are Allosteric Enzymes?
Allosteric enzymes are unique because they possess at least two distinct binding sites:
• An active site where the substrate binds to undergo the chemical reaction.
• An allosteric site (or regulatory site) where effector molecules (inhibitors or activators) bind.
When the end-product of a pathway accumulates, it binds specifically to this allosteric site. This binding induces a conformational change (a change in the shape of the enzyme) that alters the active site, preventing the substrate from binding and effectively slowing down or stopping the reaction.

3. Why other options are incorrect:
• Holoenzymes: This refers to a complete, active enzyme consisting of an apoenzyme (protein portion) bound to its necessary cofactors/coenzymes.
• Apoenzymes: This is the inactive, protein-only part of an enzyme that requires a cofactor to become active.
• Coenzymes: These are non-protein organic molecules (often derived from vitamins) that assist enzymes in performing catalytic activity, but they do not serve as the regulatory target for feedback inhibition.