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Biology MCI: Page 5
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<strong>Biology MCI: </strong>Page 5
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32. What happens to the energy of electrons as they pass through the
electron transport chain?
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<html>The electrons use their energy to be transported down the chain.</html>
<html>The electrons convert their energy into light energy as they cross a membrane.</html>
<html>The energy of the electrons is converted into heat energy, causing molecules to move faster.</html>
<html>The energy of the electrons is converted into potential energy by pumping protons across a membrane.</html>
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33. Which of the following is NOT a function of one or more protein
complexes in the electron transport chain?
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<html>transporting electrons from one complex to another</html>
<html>helping bond hydrogen to oxygen to form water molecules</html>
<html>transporting protons across the inner mitochondrial membrane</html>
<html>moving the electrons into a vesicle to create high potential energy</html>
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34. The chemical reaction for the production of ATP is shown below.<br><br>
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ADP + P<sub>i</sub> ---> ATP + H<sub>2</sub>O
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What is true of this reaction?
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<html>The reactants (ADP + P<sub>i</sub>) have LESS chemical energy than the products (ATP + H<sub>2</sub>O).</html>
<html>The reactants (ADP + P<sub>i</sub>) have MORE chemical energy than the products (ATP + H<sub>2</sub>O).</html>
<html>The reactants (ADP + P<sub>i</sub>) have the SAME chemical energy as the products (ATP + H<sub>2</sub>O).</html>
<html>It is impossible to tell anything about the energy relationships between the reactants and the products.</html>
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35. In the mitochondria, there is a membrane that has ATP synthase
embedded within it. ATP synthase is a protein complex that makes ATP.<br><br>What
must be true for ATP synthase to be able to make ATP from ADP and
phosphate (P<sub>i</sub>)?<br>The proton (H<sup>+</sup>) concentration
must be
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<html>higher on either side of the membrane.</html>
<html>higher on the outside of the membrane.</html>
<html>the same on both sides of the membrane.</html>
<html>high enough to cause H<sup>+</sup> to diffuse directly through the lipid membrane.</html>
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36. Why is it necessary to have a difference in proton (H<sup>+</sup>)
concentration across the membrane to make ATP?
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<html>There needs to be a low potential energy to get ATP.</html>
<html>The protons provide electrical energy that turns the ATP synthase into ATP.</html>
<html>The ATP synthase protein is oriented in a particular direction, and protons can only flow in one way.</html>
<html>The ATP synthase protein generates potential energy from the concentration difference in one direction.</html>
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