Enzymes: Catalysts in Biological Reactions
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Questions and Answers

What does an enzyme- substrate complex form when a substrate binds to an enzyme's active site?

  • Cofactors
  • Holoenzyme
  • Apoenzyme
  • Reactants (correct)

What is the compound on which an enzyme acts?

  • Substrate (correct)
  • Catalyst
  • Holoenzyme
  • Apoenzyme

Where does catalysis occur in an enzyme?

  • Apoenzyme
  • Holoenzyme
  • Cofactors
  • Active site (correct)

What is the energy barrier that substrates need to overcome before a reaction occurs?

<p>Activation energy (B)</p> Signup and view all the answers

What do enzymes lower in order to allow substrates to react faster?

<p>Activation energy (B)</p> Signup and view all the answers

Which of the following is true about cofactors?

<p>They can be both metals and small organic molecules. (C)</p> Signup and view all the answers

What is the function of prosthetic groups?

<p>Bind transiently to the enzyme or substrate. (A)</p> Signup and view all the answers

Which of the following is an example of a metal cofactor?

<p>Manganese (Mn) (C)</p> Signup and view all the answers

What is the main difference between absolute specificity and group specificity?

<p>Absolute specificity only acts on one reaction, while group specificity acts on specific functional groups. (A)</p> Signup and view all the answers

According to the lock-and-key model of enzyme binding, what is the nature of the active site?

<p>It is rigid in shape and complementary to the substrate. (A)</p> Signup and view all the answers

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