Introduction to Enzymes: Properties, Classifications, and Kinetics

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Questions and Answers

What type of inhibition does sulfanilamide exhibit on the enzyme that converts PABA into folic acid?

  • Uncompetitive inhibition
  • Mixed inhibition
  • Noncompetitive inhibition
  • Competitive inhibition (correct)

How does competitive inhibition affect the enzyme function compared to noncompetitive inhibition?

  • Impairs the enzyme function without structural resemblance to the substrate
  • Can be overcome by high substrate concentrations (correct)
  • Binds to ES not free E
  • Binds to the active site on the enzyme surface

What is a characteristic of noncompetitive inhibitors regarding their binding sites on enzymes?

  • Binds to ES not free E (correct)
  • Impairs the enzyme function without structural resemblance to the substrate
  • Binds to the active site on the enzyme surface
  • Can be overcome by high substrate concentrations

Which statement accurately describes uncompetitive inhibition?

<p>Can be overcome by high substrate concentrations (C)</p> Signup and view all the answers

How does increasing substrate concentration affect competitive inhibition?

<p>Overcomes inhibitor binding (A)</p> Signup and view all the answers

What distinguishes uncompetitive inhibition from competitive inhibition in terms of inhibitor binding sites?

<p>[I] binds to ES not free E (D)</p> Signup and view all the answers

In noncompetitive inhibition, what is a key characteristic of the inhibitor's structural resemblance with the substrate?

<p><strong>Inhibition cannot be overcome by addition of S</strong> (A)</p> Signup and view all the answers

What is a distinguishing feature of competitive inhibitors in terms of their mechanism of action?

<p>Inhibitors have structural resemblance with the substrate (D)</p> Signup and view all the answers

How does uncompetitive inhibition differ from noncompetitive inhibition in terms of overcoming the effects of inhibitors?

<p>Inhibition by uncompetitive inhibitors is irreversible with increased substrate levels (C)</p> Signup and view all the answers

What action can help overcome noncompetitive inhibition?

<p>Increasing [S] favors the inhibition by [I] (B)</p> Signup and view all the answers

Flashcards

Competitive Inhibition

An inhibitor binds to the active site of an enzyme, competing with the substrate for binding.

Noncompetitive Inhibition

Inhibitor binds to a site other than the active site, altering the enzyme's shape and making it less active.

Uncompetitive Inhibition

Inhibitor binds only to the enzyme-substrate complex (ES), not the free enzyme (E).

Competitive Inhibition and Substrate Concentration

Increasing substrate concentration can overcome the effects of competitive inhibition.

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Noncompetitive Inhibition and Substrate Concentration

Increasing substrate concentration does not overcome the effects of noncompetitive inhibition.

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Competitive Inhibitor Structure

Competitive inhibitors resemble the substrate in structure.

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Noncompetitive Inhibitor Structure

Noncompetitive inhibitors do not need to resemble the substrate in structure.

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Sulfanilamide's Inhibition

Sulfanilamide acts as a competitive inhibitor of the enzyme that converts PABA into folic acid.

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Uncompetitive Inhibition and Substrate Concentration

Uncompetitive inhibitors bind to the ES complex and cannot be overcome by increasing substrate concentration.

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Noncompetitive Inhibition not Overcoming

Noncompetitive inhibition cannot be overcome by adding more substrate.

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