Biology, Eighth Edition (Raven)

Chapter 7: How Cells Harvest Energy

Pre Test

1
Which is the best definition for cellular respiration? (p. 120)
A)The use of oxygen in a cell.
B)The oxidation of organic compounds to extract energy from chemical bonds.
C)Production of ATP in a cell.
D)Respiration of cells to get energy to survive.
E)Reduction of NADH to drive chemical reactions in a cell.
2
True or False: Because it has 6 carbons, glucose can power 6 cycles ("turns") of the Krebs cycle (p. 124)
A)True
B)False
3
Which of the following statements is false? (p. 124)
A)Some ATP is consumed in glycolysis.
B)Glycolysis releases two pyruvate and two CO2 molecules.
C)Some ATP is created through substrate-level phosphorylation.
D)Overall, glycolysis releases energy and is thus termed exergonic.
E)All of the above statements are true.
4
Where in a eukaryotic cell does pyruvate oxidation occur? (p. 128)
A)In the mitochondrion.
B)In the electron transport chain.
C)In the cytoplasm, just like in prokaryotes.
D)Anywhere in the cell, provided pyruvate dehydrogenase is present.
E)Two of the above are locations where pyruvate oxidation occurs.
5
True or False: The Krebs cycle is responsible for making most of the cell's ATP. (p. 129)
A)True
B)False
6
Which of the following is most directly responsible for creation of ATP at the mitochondrial inner membrane? (p. 132)
A)Vast quantities of NADH.
B)A proton gradient.
C)A lot of FADH2 in the cell.
D)Movement of electrons along the membrane itself.
E)The activity of NADH dehydrogenase.
7
Why is it misleading to say "when completely oxidized, each glucose molecule results in the production of 36 ATP molecules"? (p. 134)
A)Because of the efficiency of chemiosmosis, the result is actually much higher.
B)FADH2 actually consumes some ATP.
C)The cell membrane is somewhat leaky to H+ ions.
D)The proton gradient can facilitate other tasks besides ATP synthesis.
E)You have to add in ATP produced during glycolysis, which has nothing to do with oxidation.
8
Which of the following serve as control points to regulate the rate of glucose catabolism? (p. 135)
A)Phosphofructokinase.
B)Pyruvate dehydrogenase.
C)The electron transport chain.
D)All of the above
E)a and b only.
9
True or False: The purpose of fermentation is to make ethanol. (p. 137)
A)True
B)False
10
What process must occur to allow amino acids to be catabolized for energy?
A)Deamination
B)Depurination
C)Dephosphorylation
D)Dehydration
E)Deoxygenation
11
Primitive prokaryotes probably used H2S instead of water as a source of electrons. What would have been released into the environment as photosynthesis occurred?
A)Gaseous hydrogen
B)Liquid hydrogen
C)Water
D)HS
E)Sulfur
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