Medical Quiz

Cellular Respiration Quiz


Where is the Electron Transport Chain in the cell?

A. Cytoplasm

B. Cell Membrane

C. Inner Mitochondrial Membrane

D. Mitochondrial Matrix

What is the main job of the electron carriers in cellular respiration? 

A. Transport electrons and hydrogen atoms to the electron transport chain 

B. Capture energy throughout the process of cellular respiration

C. Provide the reactants for the process of cellular respiration

D. Pump positive hydrogen ions and shuttle electrons across the electron transport chain and contribute to chemiosmosis

How many membranes does a mitochondria have?

A. 1

B. 2

C. 3

D. 4

When hydrogen ions are pumped from the mitochondrial matrix across the inner membrane and into the intermembrane space, the result is the

A. formation of ATP.

B. restoration of the Na+/K+ balance across the membrane.

C. reduction of NAD+.

D. creation of a proton gradient.

What is the term used for the metabolic pathway in which glucose (C6H12O6) is degraded to carbon dioxide (CO2) and water?

A. oxidative phosphorylation

B. cellular respiration

C. glycolysis

D. fermentation

Which process does not occur in aerobic conditions? 

A. Fermentation

B. Pyruvate Oxidation

C. Citric Acid Cycle or Krebs cycle 

D. Oxidative Phosphorylation 

Why is ATP considered the most significant energy carrying molecule? 

A. It’s delta G is negative. 

B. ATP has different bond energy between its phosphate groups. 

C. ATP can hold large amounts of energy between all of its bonds. 

D. ATP’s positive delta G contributes to the large amounts of energy between its 3rd and 2nd phosphate groups. 

Why does the oxidation of organic compounds by molecular oxygen to produce CO2 and water release free energy?

A. The covalent bond in oxygen is unstable and easily broken by electrons from organic molecules.

B. The covalent bonds in organic molecules are higher energy bonds than those in water and carbon dioxide.

C. The electrons have a higher potential energy when associated with water and carbon dioxide than they do in organic compounds.

D. Electrons are being moved from atoms that have a lower affinity for electrons (such as C) to atoms with a higher affinity for electrons (such as O).

Which of the following statements is correct about an oxidation-reduction (or redox) reaction?

A. The molecule that is oxidized loses protons.

B. The molecule that is reduced loses electrons.

C. The molecule that is reduced gains electrons.

D. The molecule that is reduced gains electrons.

If ADP is phosphorylated then what is this indicating in the reaction? 

A. ADP is forming into ATP

B. ADP is becoming AMP

C. ADP is being used to power other reactions

D. ADP is being created by the reaction

Cellular respiration harvests the most chemical energy from which of the following?

A. substrate-level phosphorylation

B. chemiosmotic phosphorylation

C. generating carbon dioxide and oxygen in the electron transport chain

D. transferring electrons from organic molecules to pyruvate

The ATP made during glycolysis is generated by

A. electron transport.

B. chemiosmosis

C. substrate-level phosphorylation.

D. photophosphorylation.

Where does glycolysis take place in the cell?

A. Mitochondria

B. Cytosol

C. Cell Membrane

D. Mitochondrial Matrix

Where does the Citric Acid Cycle (Krebs Cycle) happen in the cell?

A. Cytosol

B. Inner Mitochondrial Membrane

C. Cell Membrane

D. Mitochondrial Matrix

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

A. eight carbon atoms

B. six carbon atoms

C. four carbon atoms

D. two carbon atoms

Where does glycolysis takes place?

A. cytosol

B. mitochondrial amtrix

C. mitochondrial inner membrane

D. mitochondrial intermembrane space

All of the following are functions of the citric acid cycle EXCEPT

A. addition of electrons and protons to oxygen to form water.

B. production of ATP.

C. release of carbon dioxide.

D. production of NADH.

During cellular respiration, acetyl CoA accumulates in which location?

A. mitochondrial matrix

B. mitochondrial inner membrane

C. mitochondrial intermembrane space

D. cytosol

Pyruvate Oxidation creates a specific numbered carbon molecule at the end of it’s process. What is the number of carbons for this molecule? 

A. 2

B. 3

C. 6

D. 1

Where are the proteins of the electron transport chain located?

A. cytosol

B. mitochondrial inner membrane

C. mitochondrial intermembrane space

D. mitochondrial matrix

Does the mitochondria have its own DNA?

A. Yes!

B. No!

The oxygen consumed during cellular respiration is involved directly in which process or event?

A. accepting electrons at the end of the electron transport chain

B. citric acid cycle

C. glycolysis

D. oxidation of pyruvate to acetyl CoA

The primary role of oxygen in cellular respiration is to

A. combine with lactate, forming pyruvate.

B. combine with carbon, forming CO2.

C. act as an acceptor for electrons and hydrogen, forming water.

D. yield energy in the form of ATP as it is passed down the respiratory chain.

How many carbons are in glucose?

A. 2

B. 4

C. 6

D. 8

Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present or absent?

A. electron transport

B. electron transport

C. glycolysis

D. citric acid cycle


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