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Cellular Respiration Trivia Quiz

Every day, all day, your cells are performing the complex process of respiration. See how much you know about this crucial process to make usable cellular energy!

A multiple-choice quiz by adams627. Estimated time: 4 mins.

Author
adams627

Time
4 mins

Type
Multiple Choice

Quiz #
300,188

Updated
Dec 03 21

# Qns
10

Difficulty
Average

Avg Score
6 / 10

Plays
4602

Awards
Top 5% quiz!

Last 3 plays: Guest 108 (5/10), Guest 126 (9/10), 211057 (6/10).

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Cellular respiration is the chemical opposite of photosynthesis. What is its basic chemical formula? Hint

6 H2O(water) + 6 CO2 (carbon dioxide) --> C6H12O6(glucose) + 6 O2 (oxygen)

C6H12O6(glucose) + 6 O2 (oxygen) --> 6 H2O(water) + 6 CO2 (carbon dioxide)

C6H12O6(glucose) + 6 CO2 (carbon dioxide) --> 6 H2O(water) + 6 O2 (oxygen)

6 H2O(water) + 6 O2 (oxygen)--> C6H12O6(glucose) + 6 CO2 (carbon dioxide)

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Question 2 of 10

2. Cellular respiration is completely aerobic, meaning that every phase needs oxygen in order to take place.

True

False

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Question 3 of 10

3. Which isn't an end product of glycolysis? Hint

2 pyruvate

2 NADH

2 ATP

2 carbon dioxide molecules

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Question 4 of 10

4. The Krebs cycle occurs within the mitochondria of a cell. Which best describes the site of the Krebs (citric acid) cycle inside the mitochondria? Hint

Outer mitochondrial membrane

Stroma

Mitochondrial matrix

Inner mitochondrial membrane

5. Before the Krebs cycle, pyruvate from glycolysis is attached to an enzyme that makes it easier to break down. Carbon dioxide is released and a molecule of NADH is formed. What name is given to the molecule that now enters the Krebs cycle? Hint

Acetyl CoA

Acetyl CoB

Phosphoglucoisomerase

Phosphofructokinase

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Question 6 of 10

6. The final step in the process of cellular respiration is the electron transport chain (ETC). What best describes the first step in the electron transport chain? Hint

Energized electrons from NADH and FADH2 activate transport proteins.

Electrons from NADH and FADH2 bond with hydrogen ions to form water molecules.

Hydrogen ions diffuse through the membrane.

Electrons in the inner membrane are energized by the Sun.

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Question 7 of 10

7. Once enough H+ ions have been pumped outside the membrane, they tend to move back inside the membrane. What is this random movement of particles from areas of high concentration to low concentration called? Hint

Diffusion

Endocytosis

Active transport

Exocytosis

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Question 8 of 10

8. As the ions move back through the membrane, they flow through the enzyme that is the center of all cellular respiration. What is this important enzyme? Hint

Acetyl CoA

Phosphoglucoisomerase

Acetyl CoB

ATP synthase

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Question 9 of 10

9. Two oxygen atoms enter the inner mitochondrial matrix at the end of the ETC. They bond with the electrons from the membrane and the protons that just passed through it to form what final product?

Answer: (One word: what oxygen and hydrogen make.)

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Question 10 of 10

10. The electron transport chain is the only way that cells make ATP.

True

False

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Dec 16 2024 : Guest 108: 5/10
Dec 16 2024 : Guest 126: 9/10
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Dec 14 2024 : colbymanram: 2/10
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Quiz Answer Key and Fun Facts

1. Cellular respiration is the chemical opposite of photosynthesis. What is its basic chemical formula?

Answer: C6H12O6(glucose) + 6 O2 (oxygen) --> 6 H2O(water) + 6 CO2 (carbon dioxide)

Not included in this chemical formula are the 40+ enzymes used in cellular respiration, or the many ATP that is the end product. In photosynthesis, sunlight, carbon dioxide, and water are used to make sugars and oxygen. Cellular respiration breaks down those sugars.

2. Cellular respiration is completely aerobic, meaning that every phase needs oxygen in order to take place.

Answer: False

Glycolysis, the introductory phase of glycolysis, occurs in the cytosol and doesn't need oxygen. During this step, two ATP are donated to break apart a glucose molecule.

3. Which isn't an end product of glycolysis?

Answer: 2 carbon dioxide molecules

By the end of glycolysis, the ATP that broke apart the glucose are made back up after the production of 4 ATP, 2 pyruvate (pyruvic acid) molecules and 2 NADH. The net gain of ATP is 2. NADH carries the electrons made from the breakup of ATP to the electron transport chain that occurs later in respiration.

4. The Krebs cycle occurs within the mitochondria of a cell. Which best describes the site of the Krebs (citric acid) cycle inside the mitochondria?

Answer: Mitochondrial matrix

Stroma is located inside chloroplasts of plant cells and is important in the process of photosynthesis. The mitochondrial membrane is important during the electron transport chain.

Answer: Acetyl CoA

Acetyl Coenzyme A is bonded together to form citric acid, which gives the process its other name. Throughout the Krebs cycle, the citric acid is contiunually broken down into smaller and smaller molecules. Carbon dioxide ATP, NADH, and another electron-carrier called FADH2 are created during this process. From the two pyruvate molecules that entered the matrix, 2 ATP, 2 FADH2, 6 carbon dioxide, and 6 NADH are made.

6. The final step in the process of cellular respiration is the electron transport chain (ETC). What best describes the first step in the electron transport chain?

Answer: Energized electrons from NADH and FADH2 activate transport proteins.

The electron transport chain in photosynthesis includes electrons being energized by solar energy, but this doesn't occur in respiration. The other two processes do occur, but not yet. The electron-carrying molecules produced through glycolysis and the Krebs cycle let their electrons flow through the ETC, activating transport proteins.

The proteins actively transport H+ ions across the membrane.

Answer: Diffusion

Active transport pumps ions from areas of low concentration (inside the membrane) to areas of high concentration (outside the membrane). The electrons carried by NADH and FADH2 were needed for the active transport during the electron transport chain.

8. As the ions move back through the membrane, they flow through the enzyme that is the center of all cellular respiration. What is this important enzyme?

Answer: ATP synthase

Typically, enzymes end in "ase" and their names reflect their jobs. In this case, ATP is synthesized when protons flow through the enzyme.

Answer: Water

For each pyruvate molecule, 2 water molecules are formed by the end of the electron transport chain.

So, the end result of respiration was:
1 glucose molecule was used in glycolysis.
4 oxygen atoms were used in the ETC and 2 were used in the Krebs cycle.

6 carbon dioxide molecules were made during the Krebs cycle.
2 water molecules were made during glycolysis and 4 were made during the ETC.
35 ATP were made from the ETC.

10. The electron transport chain is the only way that cells make ATP.

Answer: False

The process of fermentation uses modified glycolysis to make a small number of ATP and byproducts. In fact, fermentation is responsible for dough rising after yeast is cooked and alcohol being created by small organisms.

If you liked this quiz, please send me a note. I hope you enjoyed and learned something about this amazing biological process!

Source: Author adams627

This quiz was reviewed by FunTrivia editor crisw before going online.
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