1973736
Descrição
Quiz por Mrs. Reema Al Bitar, atualizado more than 1 year ago
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Criado por Mrs. Reema Al Bitar
quase 10 anos atrás
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Questão 1
Questão
1. Which of the following best describes the main purpose of the combined processes of glycolysis and cellular respiration?
Responda
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breaking down ATP, so that ADP and P can be reused
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transforming the energy in glucose and related molecules in a chemical form that cells can use for work
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the breakdown of glucose to carbon dioxide and water
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producing complex molecules from chemical building blocks
Questão 2
Questão
In the combined processes of glycolysis and cellular respiration, what is consumed and what is produced?
Responda
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Water is consumed, and ATP is produced.
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Oxygen is consumed, and glucose is produced.
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Carbon dioxide is consumed, and water is produced.
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Glucose is consumed, and carbon dioxide is produced.
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ATP is consumed, and oxygen is produced.
Questão 3
Questão
Substrate-level phosphorylation occurs _____.
Responda
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in glycolysis only
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in both glycolysis and the citric acid cycle
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during oxidative phosphorylation
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in the citric acid cycle
Questão 4
Questão
The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____.
Responda
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gains electrons and loses potential energy
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loses electrons and gains potential energy
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loses electrons and loses potential energy
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gains electrons and gains potential energy
Questão 5
Questão
When electrons move closer to a more electronegative atom, what happens? The more electronegative atom is _____.
Responda
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oxidized, and energy is released
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oxidized, and energy is consumed
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reduced, and energy is released
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reduced, and energy is consumed
Questão 6
Questão
Which of the following statements about NAD+ is true?
Responda
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NAD+ has more chemical energy than NADH.
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In the absence of NAD+, glycolysis can still function.
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NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
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NAD+ can donate electrons for use in oxidative phosphorylation.
Questão 7
Questão
Which of the following describes the process of glycolysis?
Responda
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It converts one glucose molecule to two molecules of pyruvate and carbon dioxide.
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It represents the first stage in the chemical oxidation of glucose by a cell.
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Glycolysis occurs in the mitochondria.
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Glycolysis produces 30 ATP from each molecule of glucose.
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It requires ATP and NADH.
Questão 8
Questão
The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mol and the free energy for the reduction of NAD+ to NADH is +53 kcal/mol. Why are only two molecules of NADH formed during glycolysis when it appears that as many as a dozen could be formed?
Responda
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There is no CO2 or water produced as products of glycolysis.
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Most of the free energy available from the oxidation of glucose is used in the production of ATP in glycolysis.
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Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis.
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Glycolysis is a very inefficient reaction, with much of the energy of glucose released as heat.
Questão 9
Questão
Starting with one molecule of glucose, the energy-containing products of glycolysis are _____.
Responda
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2 NAD+, 2 pyruvate, and 2 ATP
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2 NADH, 2 pyruvate, and 2 ATP
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2 FADH2, 2 pyruvate, and 4 ATP
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6 CO2, 2 pyruvate, and 2 ATP
Questão 10
Questão
Which kind of metabolic poison would most directly interfere with glycolysis?
Responda
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an agent that closely mimics the structure of glucose but is not metabolized
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an agent that reacts with NADH and oxidizes it to NAD+
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an agent that binds to pyruvate and inactivates it
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an agent that reacts with oxygen and depletes its concentration in the cell
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