11750504
Descrição
Quiz por Christina Marshall, atualizado more than 1 year ago
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Criado por Christina Marshall
mais de 6 anos atrás
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Questão 1
Questão
Which of the following pathways occurs in the cytosol?
Responda
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Glycolysis
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Breakdown of pyruvate to an acetyl group
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citric acid cycle
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oxidative phosphorylation
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all of the above
Questão 2
Questão
The net products of glycolysis are
Responda
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6 CO2, 4 ATP, and 2 NADH
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2 Pyruvate, 2 ATP, 2 NADH
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2 pyruvate, 4 ATP, 2 NADH
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2 pyruvate, 2 GTP, 2 CO2
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2 CO2, 2 ATP, glucose
Questão 3
Questão
During glycolysis, ATP is produced by
Responda
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oxidative phosphorylation
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substrate level phosphorylation
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redox reactions
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all of the above
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both a and b
Questão 4
Questão
Which organic molecule supplies a two-carbon group to start the citric acid cycle?
Responda
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ATP
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NADH
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acetyl CoA
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oxaloacetate
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both a and b
Questão 5
Questão
The ability to diagnose tumors using [18F]-fluorodeoxyglucose (FDG) is based on the phenomenon that most types of cancer cells exhibit higher levels of
Responda
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glycolysis
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pyruvate breakdown
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citric acid metabolism
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oxidative phosphorylation
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all of the above
Questão 6
Questão
In the experiment of Racker and Stoeckenius, bacteriorhodopsin was oriented in such a way that it pumped H+ into a vesicle. Each vesicle actually contained many molecules of bacteriorhodopsin. How would the results have been affected if 50% of the bacteriorhodopsin molecules pumped H+into the vesicle and 50% pumped H+ out of the vesicles?
Responda
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The same amount fo ATP would be made in the presence of light, and no ATP would be made in the dark.
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More ATP would be made in the presence of light, and no ATP would be made in the dark.
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No ATP would be made in the presence of light, and no ATP would be made in the dark
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No ATP would be made in the presence of light, but some ATP would be made in the dark.
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Some ATP would be made in both light and dark
Questão 7
Questão
Certain drugs act as ionophores that cause the mitochondrial membrane to be highly permeable to H+. How would such drugs affect oxidative phosphorylation?
Responda
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Movement of electrons down the ETC would be inhibited
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ATP synthesis would be inhibited
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ATP synthesis would be unaffected
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ATP synthesis would be stimulated
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Both a and b are correct
Questão 8
Questão
The source of energy that directly drives the synthesis of ATP during oxidative phosphorylation is the
Responda
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oxidation of NADH
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oxidation of glucose
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oxidation of pyruvate
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H+ gradient
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reduction of O2
Questão 9
Questão
Compared with oxidative phosphorylation in mitochondria, a key difference of anaerobic respiration in bacteria is that
Responda
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more ATP is made
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ATP is made only via substrate-level phosphorylation
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O2 is converted into H2O2 rather than H2O.
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something other than O2 acts as the final electron acceptor of the ETC.
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b and d
Questão 10
Questão
When muscle becomes anaerobic during strenuous exercise, why is it necessary to convert pyruvate to lactate?
Responda
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to decrease NAD+ and increase NADH
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to decrease NADH and increase NAD+
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to increase NADH and increase NAD+
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to decrease NADH and decrease NAD+
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to keep oxidative phosphorylation running
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