Cellular Respiration and Glucose Regulation

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Questions and Answers

What is the net energy yield from the conversion of one glucose molecule to two pyruvate molecules in glycolysis?

  • 30.5 kJ/mol
  • 147.4 kJ/mol
  • 36.7 kJ/mol
  • 73.4 kJ/mol (correct)

What is the role of thiaminepyrophosphate (TPP) in alcoholic fermentation?

  • Cofactor for alcohol dehydrogenase
  • Cofactor for pyruvate decarboxylase (correct)
  • Cofactor for pyruvate kinase
  • Cofactor for lactate dehydrogenase

Which enzyme catalyzes the conversion of pyruvate to lactate in anaerobic conditions?

  • Alcohol dehydrogenase
  • Lactate dehydrogenase (correct)
  • Pyruvate kinase
  • Pyruvate decarboxylase

Which control point in glycolysis is associated with a -30.5 kJ/mol decrease in free energy?

<p>Pyruvate kinase (B)</p> Signup and view all the answers

What is the subunit composition of lactate dehydrogenase in heart muscle?

<p>H4 (D)</p> Signup and view all the answers

How many ATP molecules are produced per glucose molecule in glycolysis?

<p>2 (C)</p> Signup and view all the answers

What is the purpose of the reduction of pyruvate to lactate in anaerobic conditions?

<p>To recycle NAD+ (D)</p> Signup and view all the answers

Which reaction in glycolysis has a particularly large decrease in free energy?

<p>Pyruvate kinase (B)</p> Signup and view all the answers

What is the function of pyruvate kinase in glycolysis?

<p>To catalyze the conversion of phosphoenolpyruvate to pyruvate (C)</p> Signup and view all the answers

Which reaction is associated with a decrease in free energy of -30.5 kJ/mol?

<p>Pyruvate kinase (D)</p> Signup and view all the answers

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