7 Cellular Respiration

One purpose of the electron transport chain is to A cycle NADH + H+ back to NAD+ so glycolysis can begin again. B use the intermediates from the citric acid cycle. C break down pyruvate. D increase the number of protons in the mitochondrial matrix. E consume excess ATP.

A

Proteins and fats may be used as energy sources to drive aerobic respiration. A True B False

A

The ATP made during glycolysis is generated by A substrate-level phosphorylation. B electron transport. C photophosphorylation. D chemiosmosis. E oxidation of NADH to NAD+

A

The main function of cellular respiration is the A conversion of energy stored in the chemical bonds of glucose to an energy form that the cell can use. B recovery of NAD+ from NADPH. C conversion of kinetic to potential energy. D reduction of free energy in the cell. E elimination of excess glucose from the cell.

A

When a molecule of NAD gains a hydrogen atom, the molecule becomes reduced. A True B False

A

When heart muscles cells are deprived of oxygen, the heart still pumps. What must the heart cells be able to do? A derive sufficient energy from fermentation B continue aerobic metabolism when skeletal muscle cannot C transform lactate back to pyruvate D remove lactate from the blood E remove oxygen from lactate

A

Which of the following do yeast produce during fermentation? A Ethanol. B NADH. C Lactate. D Pyruvate. E Glucose.

A

Which of the following processes will occur in the presence or absence of oxygen? A glycolysis B electron transport chain C oxidative phosphorylation D cellular respiration E citric acid cycle

A

Which of the following statements is true? A The citric acid cycle occurs in the mitochondria matrix. B Glycolysis occurs in the mitochondria inner membrane. C Oxidative phosphorylation occurs in the mitochondria matrix. D The citric acid cycle occurs in the cytosol. E Electron transport chain and ATP synthase are in the cytosol.

A

Fermentation is a more efficient form of energy production than aerobic respiration. A True B False

B

Oxygen is an excellent final electron acceptor because of its low electronegativity. A True B False

B

Which would be TRUE if an inhibitor blocked the activity of mitochondrial ATP synthase? A The pH in the space between the mitochondrial membranes would decrease. B The pH in the space between the mitochondrial membranes would increase. C ATP synthesis would increase. D Oxygen consumption would decrease. E The concentration of NADH would increase.

B

Oxygen is used by A glycolysis. B the citric acid cycle. C the electron transport chain. D protons. E ATP synthase.

C

The citric acid cycle begins with A glucose. B pyruvate. C acetyl CoA. D NADH + H+. E ATP synthase.

C

The synthesis of ATP from ADP and P is an _______ reaction. In mitochondria, ATP synthesis is driven by the flow of _______ down the concentration and electrical gradient established by _______. A endergonic; Na+ ions; electron transport B exergonic; protons; glycolysis C endergonic; protons; electron transport D exergonic; Na+ ions; glycolysis E endergonic; protons; citric acid cycle

C

Where are the protein complexes associated with the electron transport chain located? A mitochondrial matrix B mitochondrial membrane C mitochondrial inner membrane D mitochondrial intermembrane space E cytosol

C

Which of the following processes occurs when oxygen is unavailable? A Pyruvate oxidation B The citric acid cycle C Fermentation D An electron transport chain E All of the above

C

Which of the following statements is TRUE of both aerobic and anaerobic respiration? A Both use glycolysis to oxidize glucose to pyruvate. B Both produce NADH as high-energy intermediates. C Both produce either lactic acid or ethanol as a biproduct. D Both use glycolysis to oxidize glucose to pyruvate and both produce NADH as high-energy intermediates. E Both produce NADH as high-energy intermediates and both produce either lactic acid or ethanol as a bioproduct.

D

Cellular respiration produces the most energy in the form of ATP from which of the following? A production of lactate B the citric acid cycle C substrate-level phosphorylation D glycolysis E oxidative phosphorylation

E

Where does glycolysis takes place? A mitochondrial matrix B mitochondrial membrane C mitochondrial inner membrane D mitochondrial intermembrane space E cytosol

E

Which occurs only in anaerobic metabolism of glucose? A citric acid cycle B glycolysis C acetyl CoA formation D oxidative phosphorylation E lactate fermentation

E

Which of the following are the final products of glucose metabolism during aerobic cell respiration? A ATP only B heat only C carbon dioxide only D both ATP and heat only E ATP, heat,and carbon dioxide

E

Which of the following statements about the electron transport chain is true? A Electrons are received from NADH and FADH2. B Electrons are passed from donor to recipient carrier molecules in a series of oxidation-reduction reactions. C Usually the terminal electron acceptor is oxygen. D Most of the enzymes are part of the inner mitochondrial membrane. E All of the above

E