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| 1 | |
If ATP synthase is enzymatically neutralized within a cell, which of the following consequences would be the most logical outcome? |
| | A) | Negative feedback will be decreased, causing faster ATP production. |
| | B) | The electron transport chain will slow down. |
| | C) | The cell will have no mechanism to make ATP and will die. |
| | D) | Phosphylation of ADP will decrease. |
| | E) | All of the above will occur. |
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| 2 | |
For one molecule of glucose, what is the maximum number of ATP molecules created directly from the Krebs cycle? |
| | A) | 1 |
| | B) | 2 |
| | C) | 3 |
| | D) | 4 |
| | E) | 5 |
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| 3 | |
What is the name of the mechanism by which pyruvate dehydrogenase is inhibited by the end-product of the biochemical pathway? |
| | A) | Anabolism |
| | B) | Catabolism |
| | C) | Regulation |
| | D) | Negative inhibition |
| | E) | Anti-phosphorylation |
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| 4 | |
During yeast fermentation, CO2 is produced, but animal cells do not produce CO2. What is the difference in their fermentation strategies? |
| | A) | Yeast fermentation creates ethanol. |
| | B) | Animal cells create ATP and ethanol. |
| | C) | Animal cells do not undergo fermentation. |
| | D) | Yeast cells ferment pyruvate to lactic acid. |
| | E) | There is no difference in their fermentation pathways. |
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| 5 | |
Which of the following argues most strongly for glycolysis as one of the most primitive biochemical pathway? |
| | A) | It does not require oxygen in order to function. |
| | B) | It occurs in the cytoplasm of cells. |
| | C) | It is exergonic, and therefore obeys the laws of thermodynamics which are fundamental to chemistry and physics. |
| | D) | This biochemical pathway has been retained by all living organisms. |
| | E) | There is no evidence that glycolysis is primitive |
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| 6 | |
Cellular respiration is |
| | A) | the utilization 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) | the conversion of the energy of sunlight to chemical energy. |
| | E) | reduction of NADH to drive chemical reactions in a cell. |
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| 7 | |
Because it has 6 carbons, glucose can power 6 cycles ("turns") of the Krebs cycle |
| | A) | True |
| | B) | False |
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| 8 | |
Which of the following statements is false? |
| | A) | Some ATP is consumed in glycolysis. |
| | B) | The end product of glycolysis is lactic acid or ethanol. |
| | 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. |
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| 9 | |
Where in a eukaryotic cell does pyruvate oxidation occur? |
| | 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) | In ribosomes. |
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| 10 | |
The Krebs cycle is responsible for making most of the cell's ATP. |
| | A) | True |
| | B) | False |
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| 11 | |
Which of the following is most directly responsible for creation of ATP at the mitochondrial inner membrane? |
| | A) | NADH |
| | B) | A proton gradient |
| | C) | FADH2 |
| | D) | Movement of electrons along the membrane itself |
| | E) | The activity of NADH dehydrogenase |
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| 12 | |
Which of these is one of the correct reasons that less than the theoretical amount of ATP (36-38) is actually created during aerobic respiration? |
| | 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 electrons. |
| | 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. |
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| 13 | |
True or False: The purpose of fermentation is to make ethanol. |
| | A) | True |
| | B) | False |
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| 14 | |
What process must occur to allow amino acids to be catabolized for energy? |
| | A) | Deamination |
| | B) | Depurination |
| | C) | Dephosphorylation |
| | D) | Dehydration |
| | E) | Deoxygenation |
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| 15 | |
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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