Respiration Quiz

A vibrant and educational illustration of cellular respiration, featuring mitochondria, ATP synthesis, and the process of glycolysis with colorful annotations and diagrams.

Respiration Challenge Quiz

Test your knowledge of cellular respiration in this engaging quiz that covers essential metabolic pathways, energy production, and the role of oxygen in biological systems.

Whether you are a student looking to reinforce your understanding or an enthusiast wanting to learn more, this quiz includes:

20 multiple-choice questions
Topics ranging from glycolysis to oxidative phosphorylation
Instant feedback on your answers

20 Questions5 MinutesCreated by MovingMolecule421

A child is born with a rare disease in which mitochondria are missing from skeletal muscle cells. Physicians find that the muscles function. Not surprisingly, they also find that

A. The muscle contain large amounts of lactic acid following even mild physical exercise.

B. The muscles require extremely large amounts of carbon dioxide to function.

C. The muscles require extremely high levels of oxygen to function.

D. The muscle cells cannot spit glucose to pyruvate.

E. The muscles contain large amounts of carbon dioxide following even mild physical exercise.

Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?

A. Synthesis of acetyl CoA from pyruvate (oxidation of pyruvate)

B. glycolysis

C. The electron transport chain

D. The citric acid cycle

E. Reduction of pyruvate to lactate

During which of the following stages of cellular respiration does substrate-level phosphorylation take place?

Each FADH2 yields a maximum of ____________ ATP and each NADH yields a maximum of ____________ ATP as a result of transferring pairs of electrons to the electron transport chain.

Muscle soreness associated with strenuous exercise is at least partly due to

A. An excess of ATP that builds up during vigorous exercise.

B. The accumulation of alcohol from anaerobic respiration.

C. None of the choices are correct.

D. The presence of lactic acid produced during fermentation in the muscle cells.

E. The large amount of carbon dioxide that builds up in the muscle.

Most CO2 from catabolism is released during

During redox reactions

A. None of the choices are correct.

B. Electrons are lost from one substance and added to another substance.

C. Protons from one molecule replace the electrons lost from another molecule.

D. A substance that gains electrons is said to be oxidized.

E. The loss of electrons from one substance is called reduction.

Between glycolysis and the citric acid cycle,

A. A carbon atom is added to make a four-carbon compound.

B. Pyruvate is oxidized while a molecule of NAD+ is reduced to NADH.

C. More than one of the choices is correct.

D. None of the choices are correct.

E. coenzyme A is cleaved off of the four-carbon compound.

The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is

The energy yield from the complete aerobic breakdown of a single molecule of glucose

A. Is equivalent to the yield from alcoholic fermentation.

B. Is less than the yield from anaerobic respiration.

C. Increases as the supply of oxygen increases.

D. Can vary with the mechanism used to shuttle NADH electrons into the mitochondria.

E. Is always 38 ATP.

The immediate energy source that drives ATP synthesis by ATP synthase during oxidative phosphorylation is the

A. H+ concentration across the membrane holding ATP synthase.

B. Affinity of oxygen for electrons.

C. Flow of electrons down the electron transport chain.

D. Oxidation of glucose and other organic compounds.

E. Transfer of phosphate to ADP.

Which of the following are products of cellular respiration?

When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?

A. NAD+ is oxidized.

B. The pH of the matrix increases.

C. ATP synthase pumps protons by active transport.

D. The electrons gain free energy.

E. The cytochromes phosphorylate ADP to form ATP.

Cyanide differs from dinitrophenol because cyanide

A. None of the choices are correct.

B. Is highly toxic to human cells and dinitrophenol is nontoxic.

C. Is an electron transport blocker and dinitrophenol is a reaction uncoupler.

D. Inhibits the production of ATP by inhibiting ATP synthase; dinitrophnol causes mitochondrial membranes to become less permeable to H+ ions.

E. Makes the membrane of mitochondria leaky to H+ ions and prevents a concentration gradient from building up; dinitrophenol blocks the passage of electrons through the electron carriers.

What is the oxidizing agent in the following reaction: Pyruvate + NADH + H+ yields Lactate + NAD+

Bacteria that are unable to survive in the presence of oxygen are called

In the mitochondria, exergonic redox reactions

A. Provide the energy that establishes the proton gradient.

B. Are the source of energy driving prokaryotic ATP synthesis.

C. Are coupled via phosphorylated intermediates to endergonic processes.

D. Are directly coupled to substrate-level phosphorylation.

E. Reduce carbon atoms to carbon dioxide.

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