CHAPTER 9 HW

25 July 2022
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question
When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
answer
The pH of the matrix increases.
question
The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is
answer
oxygen.
question
In mitochondria, exergonic redox reactions
answer
provide the energy that establishes the proton gradient.
question
What is the reducing agent in the following reaction? Pyruvate+NADH+H+→Lactate+NAD+
answer
NADH
question
Which of the following best describes the main purpose of the combined processes of glycolysis and cellular respiration?
answer
conserving the energy in glucose and related molecules in a chemical form that cells can use for work
question
In the combined processes of glycolysis and cellular respiration, what is consumed and what is produced?
answer
Glucose is consumed, and carbon dioxide is produced.
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Which of the following describes the process of glycolysis?
answer
Which of the following describes the process of glycolysis? It represents the first stage in the chemical oxidation of glucose by a cell. It produces ATP and NADH.
question
A glucose molecule is completely broken down to carbon dioxide and water in glycolysis and the citric acid cycle, but together these two processes yield only a few molecules of ATP. What happened to most of the energy that the cell obtains from the oxidation of glucose?
answer
It is stored in NADH and FADH2
question
Which statement about the citric acid cycle is correct?
answer
The last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle.
question
The electrons stripped from glucose in cellular respiration end up in which compound?
answer
water
question
Which one of the following statements about the chemiosmotic synthesis of ATP is correct?
answer
The chemiosmotic synthesis of ATP requires that the electron transport in the inner mitochondrial membrane be coupled to proton transport across the same membrane.
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Which one of the following statements about the redox reactions of the electron transport chain is correct?
answer
The redox reactions of the electron transport chain are directly coupled to the movement of protons across a membrane
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In the absence of oxygen, what is the net gain of ATP for each glucose molecule that enters glycolysis?
answer
2 ATP
question
In most cells, not all of the carbon compounds that participate in glycolysis and the citric acid cycle are converted to carbon dioxide by cellular respiration. What happens to the carbon in these compounds that does not end up as CO2?
answer
The carbon compounds are removed from these processes to serve as building blocks for other complex molecules.
question
Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?
answer
glycolysis