Citric Acid and Fruit

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Questions and Answers

In one turn through the Krebs cycle, how many molecules of ATP are produced?

  • Two molecules of ATP (correct)
  • Three molecules of ATP
  • Four molecules of ATP
  • One molecule of ATP

How many molecules of NADH are produced in one turn through the Krebs cycle?

  • Three molecules of NADH (correct)
  • Two molecules of NADH
  • Four molecules of NADH
  • One molecule of NADH

What is the first product formed in the Krebs cycle?

  • Acetyl-CoA
  • Citric acid (correct)
  • Oxaloacetate
  • Pyruvate

What is the waste product released when the third carbon from pyruvate combines with oxygen?

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

What is the main purpose of the Krebs cycle?

<p>To transfer energy stored in pyruvate to NADH and FADH2 (B)</p> Signup and view all the answers

How many energy-carrier molecules are produced after two turns through the Krebs cycle?

<p>16 (B)</p> Signup and view all the answers

Why is it necessary for the Krebs cycle to go through two turns?

<p>Glycolysis produces two pyruvate molecules when it splits glucose (D)</p> Signup and view all the answers

What happens to the original glucose molecule after the second turn through the Krebs cycle?

<p>It has been broken down completely, and all six of its carbon atoms have combined with oxygen to form carbon dioxide (D)</p> Signup and view all the answers

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