Question

part a
which of these statements about enzyme inhibitors is true?
view available hint(s)
hint 1
consider how enzymes function
a competitive inhibitor binds to the enzyme outside the active site.
the action of competitive inhibitors may be reversible or irreversible.
a non - competitive inhibitor does not change the shape of the active site.
when the product of an enzyme or a series of enzyme - catalyzed reactions acts as its inhibitor this is known as positive feedback.

Explanation:

1. A competitive inhibitor binds to the active - site of the enzyme, not outside it, so the first option is false.
2. Competitive inhibitors can bind reversibly to the active - site of an enzyme. Their action can be reversed by increasing the substrate concentration, so the second option is true.
3. Non - competitive inhibitors bind to a site other than the active - site and cause a conformational change in the enzyme, including the active - site, so the third option is false.
4. When the product of an enzyme or a series of enzyme - catalyzed reactions acts as its inhibitor, it is known as negative feedback, not positive feedback, so the fourth option is false.

Answer:

B. The action of competitive inhibitors may be reversible or irreversible