CH 9 Practice Problems

E

Among the products of glycolysis, which compounds contain energy that can be used by other biological reactions? A. NADH only B. CO2 only C. ATP and NADH only D. ATP only E. pyruvate, ATP, and NADH F. O2 only G. pyruvate and ATP only

C

During electron transport, energy from _____ is used to pump hydrogen ions into the _____. A. NADH and FADH2 ... mitochondrial matrix B. NADH ... intermembrane space C. NADH and FADH2 ... intermembrane space D. acetyl CoA ... intermembrane space E. NADH ... mitochondrial matrix

D

For each glucose that enters glycolysis, _____ NADH + H+ are produced by the citric acid cycle. A. 0 B. 3 C. 2 D. 6 E. 3 to 6

A

For each glucose that enters glycolysis, _____ acetyl CoA enter the citric acid cycle. A. 2 B. 5 C. 0 D. 1 E. 4

E

How many NADH are produced by glycolysis? A. 5 B. 1 C. 3 D. 4 E. 2

D

How would anaerobic conditions (when no O2 is present) affect the rate of electron transport and ATP production during oxidative phosphorylation? (Note that you should not consider the effect on ATP synthesis in glycolysis or the citric acid cycle.) A. Neither electron transport nor ATP synthesis would be affected. B. Electron transport would stop but ATP synthesis would be unaffected. C. Electron transport would be unaffected but ATP synthesis would stop. D. Both electron transport and ATP synthesis would stop.

A

In cellular respiration, most ATP molecules are produced by _____. A. oxidative phosphorylation B. photosynthesis C. substrate-level phosphorylation D. cellular respiration E. photophosphorylation

D

In glycolysis there is a net gain of _____ ATP. A. 5 B. 3 C. 4 D. 2 E. 1

D

In glycolysis, what starts the process of glucose oxidation? A. ADP B. FADH2 C. hexokinase D. ATP E. NADPH

B

In mitochondrial electron transport, what is the direct role of O2? A. to oxidize NADH and FADH2 from glycolysis, acetyl CoA formation, and the citric acid cycle B. to function as the final electron acceptor in the electron transport chain C. to provide the driving force for the production of a proton gradient D. to provide the driving force for the synthesis of ATP from ADP and Pi

D

In the citric acid cycle, ATP molecules are produced by _____. A. photophosphorylation B. photosynthesis C. oxidative phosphorylation D. substrate-level phosphorylation E. cellular respiration

D

Into which molecule are all the carbon atoms in glucose ultimately incorporated during cellular respiration? A. Water B. ATP C. NADH D. Carbon dioxide

C

Starting with one molecule of glucose, glycolysis results in the net production of which of the following sets of energy-containing products? A. 2 NAD+, 2 pyruvate, and 2 ATP B. 6 CO2, 2 pyruvate, and 2 ATP C. 2 NADH, 2 pyruvate, and 2 ATP D. 4 NADH, 2 pyruvate, and 4 ATP

E

The electrons stripped from glucose in cellular respiration end up in which compound? A. NADH B. ATP C. oxygen D. carbon dioxide E. water

C

The final electron acceptor of cellular respiration is _____. A. water B. CO2 C. oxygen D. FADH2 E. NADH

D

The immediate energy source that drives ATP synthesis by ATP synthase during oxidative phosphorylation is the A. affinity of oxygen for electrons. B. transfer of phosphate to ADP. C. oxidation of glucose and other organic compounds. D. H+ concentration across the membrane holding ATP synthase. E. flow of electrons down the electron transport chain.

D

The proximate (immediate) source of energy for oxidative phosphorylation is _____. A. NADH and FADH2 B. substrate-level phosphorylation C. ATP synthase D. kinetic energy that is released as hydrogen ions diffuse down their concentration gradient E. ATP

B.

The reduced form of the electron acceptor in glycolysis is ________. A. NAD+ B. NADH C. FAD D. FADH2

A

What is the oxidizing agent in the following reaction? Pyruvate + NADH + H+ → Lactate + NAD+ A. pyruvate B. lactate C. NADH D. oxygen E. NAD+

B

When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs? A. ATP synthase pumps protons by active transport. B. The pH of the matrix increases. C. The electrons gain free energy. D. The cytochromes phosphorylate ADP to form ATP. E. NAD+ is oxidized.

mitochondrial matrix

Where does acetyl CoA formation and the citric acid cycle take place?

cytosol

Where does glycolysis take place?

C

Which molecule is metabolized in a cell to produce energy "currency" in the form of ATP? A. Phosphate B. Carbon dioxide C. Glucose D. ADP

A

Which of the following metabolic processes normally occurs regardless of whether or not oxygen (O2) is present? A. glycolysis B. lactate fermentation C. citric acid cycle D. oxidative phosphorylation

C

Which of the following processes is driven by chemiosmosis? A. ATP hydrolysis B. substrate-level phosphorylation C. oxidative phosphorylation D. reduction of NAD+ to NADH

C

Which of the following statements about the electron transport chain is true? A. The electron transport chain is the first step in cellular respiration. B. Electrons gain energy as they move down the chain. C. NADH and FADH2 donate their electrons to the chain. D. Water is the last electron acceptor.

E

Which of these enters the citric acid cycle? A. NADH + H+ B. pyruvate C. glucose D. G3P E. acetyl CoA

A

Which of these is NOT a product of glycolysis? A. FADH2 B. pyruvate C. ATP D. NADH

D

Which of these is NOT a product of the citric acid cycle? A. ATP B. FADH2 C. CO2 D. acetyl CoA E. NADH + H+

D

Which stage of glucose metabolism produces the most ATP? A. Fermentation of pyruvate to lactate B. Glycolysis C. Krebs cycle D. Electron transport and chemiosmosis

A

___________ is the compound that functions as the electron acceptor in glycolysis. A. NAD+ B. NADH C. FAD D. FADH2

inner mitchondrial membrane

where is oxidative phosphorylation take place?