Which of the following statements correctly describes the role of oxygen in cellular respiration?:

When glucose is oxidized to CO2 and water, approximately 66% of its energy is transformed to:

heat

Glucose made from six radioactively labeled carbon atoms is fed to yeast cells in the absence of oxygen atom is fed to yeast cells in the absence of oxygen. How many molecules of radioactive alcohol (C2H5OH) are formed from each molecuke of glucose?:

2

Muscle cells in oxygen deprivation gain which of the following from the reduction of pyruvate?:

a. ATP and NAD+

When electrons move closer to a more electronegative atom:

a. energy is released.

Substrate-level phosphorylation:

a. is the energy source for facultative anaerobes under anaerobic conditions.

Glycolysis is considered one of the first metabolic pathways to have evolved because:

a. it is nearly universal, is located in the cytosol, and does not involve O2

Which of the following statements correctly describes the role of oxygen in cellular respiration?

e. It is the final electron acceptor for the electron transport chain.

Which of the following conversions represents a reduction reaction?:

b. acetaldehyde (C2H4O) to ethanol (C2H6O).

Fats and proteins can be used as fuel in the cell because they:

b. can be converted to intermediates of glycolysis or the citric acid cycle.

Some prokaryotes use anaerobic respiration, a process that:

b. uses a substance other than oxygen as the final electron acceptor.

In the chemiosmotic mechanism:

c. ATP production is linked to the proton gradient established by the electron transport chain.

Which of the following statements describes a possible function of brown fat, which has uncoupler proteins that, when activated, make the inner mitochondrial membrane leaky to H+? :

c. Because it dissipates the proton gradient, it generates heat through cellular respiration without producing ATP, thereby raising the body temperature of hibernating mammals or newborn infants.

Which of the following statements is false concerning the enzyme phosphofructokinase? :

c. It is inhibited by AMP

Which of the following statment is incorrect concerning oxidative phosphorylation?:

c. It uses oxygen as the final electron donor.

Which of the following substances produces the most ATP per gram? :

c. fats, because they are highly reduced compounds.

When pyruvate is coverted to acetyl CoA:

d. a multienzyme complex removes a carboxyl group, transfers electrons to NAD+, and attaches a coenzyme.

Fermentation produces less ATP than cellular respiration beause:

e. a, b, and c are correct

Which of the following reactions is incorrectly paired with its location?:

e. citric acid cycle-cristae of mitochondrion.

Which of the following compounds produces the most ATP when oxidized?:

e. glucose.

In the reaction C6H12O6 + 6O2 --> 6O2 + 6H2O:

e. oxygen becomes reduced.