Lactose Intolerance and Lactase Deficiency Quiz
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Questions and Answers

Which of the following is a key characteristic of glucoamylase?

  • It begins cleavage at the reducing end of saccharides.
  • It is heavily glycosylated to protect it from digestive proteases. (correct)
  • It has a single catalytic site.
  • It is specific for the α–1,6 bonds between glucose residues.

    • What is the primary role of α-amylase in relation to glucoamylase?

  • α-amylase splits large polysaccharides, generating new substrate molecules for glucoamylase. (correct)
  • α-amylase cleaves the glucoamylase enzyme, reducing its activity.
  • α-amylase and glucoamylase have the same catalytic activity and work synergistically.
  • α-amylase inhibits the activity of glucoamylase.

    • What is the main difference between the two catalytic sites of the sucrase–isomaltase complex?

  • One site has maltase activity, while the other has sucrase activity.
  • The two sites have the same substrate specificity, but differ in their catalytic activities.
  • One site hydrolyzes sucrose, while the other hydrolyzes isomaltose.
  • One site is responsible for hydrolyzing α-1,4 bonds, while the other hydrolyzes α-1,6 bonds. (correct)

    • Which enzyme is responsible for the majority of maltose hydrolysis in the small intestine?

    <p>Sucrase-isomaltase complex</p> Signup and view all the answers

    How many catalytic sites does the trehalase enzyme have?

    <p>One</p> Signup and view all the answers

    What is the primary function of the brush border membrane in the small intestine?

    <p>To absorb nutrients from the intestinal lumen.</p> Signup and view all the answers

    Which of the following is a characteristic of the sucrase-isomaltase complex?

    <p>It is cleaved by intestinal proteases into two separate subunits.</p> Signup and view all the answers

    Which enzyme is primarily responsible for the hydrolysis of sucrose in the small intestine?

    <p>Sucrase-isomaltase complex</p> Signup and view all the answers

    What is the primary function of the glycosylation of glucoamylase?

    <p>To protect the enzyme from degradation by digestive proteases.</p> Signup and view all the answers

    Which enzyme is responsible for the hydrolysis of isomaltose in the small intestine?

    <p>Sucrase-isomaltase complex</p> Signup and view all the answers

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