An allosteric site on an enzyme is
Correct answer: B. a site away from the active site where a regulatory molecule binds and changes the enzyme's shape
- A. a second active site that binds the same substrate
- B. a site away from the active site where a regulatory molecule binds and changes the enzyme's shape
- C. the region that is denatured first by heat
- D. the point where the enzyme attaches to the cell membrane
Explanation
A molecule binding at an allosteric site alters the conformation of the whole enzyme, and therefore the shape of the active site, either activating or inhibiting it. Non competitive inhibition and feedback inhibition both work this way, which is why adding more substrate cannot overcome them. The site is chemically distinct from the active site and binds a different molecule.
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About Enzyme Inhibitors
Enzyme inhibitors reduce reaction rate by interfering with enzyme-substrate interaction or catalytic activity. Coverage includes reversible competitive, non-competitive and uncompetitive inhibition, the effects of inhibitor concentration on reaction rate, and why competitive inhibition can be reduced by increasing substrate concentration.
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