Ch. 9 Quiz Flashcards
Which of the following normally occurs regardless of whether or not oxygen is present?
a) glycolysis
b) fermentation
c) citric acid cycle
d) oxidation of pyruvate to acetyl coA
e) oxidative phosphorylation (chemiosmosis)
glycolysis
What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
Catabolic pathways
The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction…
loses electrons and loses potential energy
Which of the following statements describes NAD+?
a) NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle
b) NAD+ has more chemical energy than NADH
c) NAD+ can donate electrons for use in oxidative phosphorylation
d) NAD+ is oxidized by the action of hydrogenases
e) in the absence of NAD+, glycolysis can still function
A) NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle
Which of these equations describes aerobic cellular respiration?
glucose + oxygen –> carbon dioxide + water + energy
The oxygen consumed during cellular respiration is involved directly in which process or event?
Accepting electrons at the end of the electron transport chain
Which of the following is the correct sequence of stages in cellular respiration?
Glycolysis, citric acid cycle, electron transport chain
In addition to ATP, what are the end products of glycolysis?
NADH and pyruvate
Carbon dioxide is released during which of the following stages of cellular respiration?
a) glycolysis and the oxidation of pyruvate to acetyl CoA
b) oxidation of pyruvate to acetyl CoA and the citric acid cycle
c) the citric acid cycle and oxidative phosphorylation
d) oxidative phosphorylation and fermentation
e) fermentation and glycolysis
b. oxidation of pyruvate to acetyl CoA and the citric acid cycle
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of…
ATP, CO2 and ethanol
