Why is each enzyme specific to one substrate (or a small group of similar substrates)?

• AEach enzyme is produced in a different organ so never meets other substrates
• BThe active site has a unique 3D shape that is complementary only to a specific substrate — other molecules cannot bind because their shape does not match
• CEnzymes can only work at one specific temperature, limiting the substrates they encounter
• DEnzymes are destroyed after use and reformed to match new substrates

Choose an answer — or press 1234