Carbohydrate Digestion Enzymes Quiz
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Questions and Answers

What is the primary enzyme responsible for initiating carbohydrate digestion in the mouth?

  • Bicarbonate
  • Salivary amylase (correct)
  • Pancreatic α-amylase
  • Lactase
  • What is the primary function of the sucrase site in the sucrase-isomaltase complex?

  • To split sucrose into glucose and fructose (correct)
  • To cleave trehalose into glucose
  • To break down lactose into glucose and galactose
  • To hydrolyze maltose into two glucose molecules
  • What bond does isomaltase cleave in maltose?

  • α(1,4) bond (correct)
  • α(1,2) bond
  • β(1,4) bond
  • α(1,6) bond
  • Which substances are formed from the hydrolysis of starch by pancreatic α-amylase?

    <p>Limit dextrins and oligosaccharides</p> Signup and view all the answers

    What is the role of trehalase in the body?

    <p>To convert trehalose into glucose</p> Signup and view all the answers

    Where does the further digestion of carbohydrates primarily occur after the stomach?

    <p>Small intestine</p> Signup and view all the answers

    What is lactose intolerance primarily caused by?

    <p>Low levels of lactase</p> Signup and view all the answers

    What role does bicarbonate secreted by the pancreas play in digestion?

    <p>It neutralizes gastric acid.</p> Signup and view all the answers

    When does lactase activity generally begin to decline in humans?

    <p>Around 5 to 7 years of age</p> Signup and view all the answers

    Which glycosidase is specifically noted for having the highest activity against maltose?

    <p>Maltase-glucoamylase</p> Signup and view all the answers

    Which of the following monosaccharides are produced by the action of sucrase?

    <p>Glucose and fructose</p> Signup and view all the answers

    What type of carbohydrates are formed from limit dextrins during digestion?

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

    What type of enzyme is lactase considered to be?

    <p>A glycoside hydrolase</p> Signup and view all the answers

    Which of the following enzymes is NOT involved in carbohydrate digestion at the brush border?

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

    What distinguishes the two subunits of maltase-glucoamylase?

    <p>A differing substrate specificity</p> Signup and view all the answers

    Which of the following statements about lactase is true?

    <p>Its activity increases significantly before birth.</p> Signup and view all the answers

    What is the primary product of the enzymatic action of trehalase?

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

    What is the condition most commonly associated with low levels of lactase?

    <p>Lactose intolerance</p> Signup and view all the answers

    What occurs to lactase activity around 5 to 7 years of age in most individuals?

    <p>It decreases to adult levels</p> Signup and view all the answers

    Which site of the sucrase-isomaltase complex is responsible for cleaving maltose?

    <p>Isomaltase site</p> Signup and view all the answers

    What happens to the body’s ability to digest lactose after infancy?

    <p>It gradually declines</p> Signup and view all the answers

    What type of bond does isomaltase cleave in limit dextrins?

    <p>α(1,6) bond</p> Signup and view all the answers

    What initiates the digestion of carbohydrates in the mouth?

    <p>Salivary amylase</p> Signup and view all the answers

    Which of the following monosaccharides is NOT produced by the action of the sucrase site?

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

    What substance is formed from the action of pancreatic α-amylase?

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

    Where are glycosidases that convert disaccharides to monosaccharides located?

    <p>On the membrane of absorptive cells</p> Signup and view all the answers

    What is the primary function of lactase in the digestive system?

    <p>Break down lactose into glucose and galactose</p> Signup and view all the answers

    What are limit dextrins formed from?

    <p>Incompletely digested starch</p> Signup and view all the answers

    What type of enzyme is maltase-glucoamylase considered?

    <p>Alpha-glucosidase</p> Signup and view all the answers

    What role does pancreatic α-amylase have in carbohydrate digestion?

    <p>Continue starch digestion in the small intestine</p> Signup and view all the answers

    What is the primary substrate of maltase-glucoamylase's N-terminal domain?

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

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