Higher human biology Unit 1.6

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1. what term is used to describe that an enzyme can only act on one substrate. The active site is a complementary shape to the substrate.

  • active site
  • special
  • specific
  • inhibitor
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Other questions in this quiz

2. How does a competitive inhibitor slow down the reaction rate?

  • Molecules of inhibitor don't fit the active site
  • When molecules of inhibitor bind to the allosteric site, changing the shape of the active site.
  • Molecules of inhibitor compete for the active site with the substrate.
  • Molecules of substrate compete for the active site with the enzyme

3. How does the action of a non competitive inhibitor slow down reaction rate?

  • Molecules of substrate compete for the active site.
  • Molecules of inhibitor compete for the active site.
  • Molecules of inhibitor bind to a different site on the enzyme, changing the shape of the active site. The substrate will no longer fit the active site.
  • Molecules of inhibitor compete for the allosteric site

4. What word is used to describe a chemical which decreases the rate of a reaction?

  • substrate
  • enzyme
  • inhibitor
  • active site

5. Why will the reaction rate plateau despite the substrate concentration still increasing?

  • The substrate concentration has become a limiting factor as all the active sites are occupied.
  • The enzyme concentration has become a limiting factor as all the active sites are occupied.
  • The enzyme concentration has become a limiting factor as all the active sites are free.
  • The enzyme concentration has become an inhibitor as all the active sites are occupied.

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