Energy Metabolism

Description: This quiz covers the topic of energy metabolism, including the processes of cellular respiration, glycolysis, the Krebs cycle, and oxidative phosphorylation.
Number of Questions: 15
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Tags: energy metabolism cellular respiration glycolysis krebs cycle oxidative phosphorylation
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What is the first stage of cellular respiration?

  1. Glycolysis

  2. Krebs cycle

  3. Oxidative phosphorylation

  4. Electron transport chain


Correct Option: A
Explanation:

Glycolysis is the first stage of cellular respiration, where glucose is broken down into two molecules of pyruvate.

What is the final stage of cellular respiration?

  1. Glycolysis

  2. Krebs cycle

  3. Oxidative phosphorylation

  4. Electron transport chain


Correct Option: C
Explanation:

Oxidative phosphorylation is the final stage of cellular respiration, where most of the ATP is produced.

What is the role of glycolysis in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option: A
Explanation:

Glycolysis is the process of breaking down glucose into two molecules of pyruvate.

What is the role of the Krebs cycle in cellular respiration?

  1. To break down pyruvate into acetyl-CoA

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option: A
Explanation:

The Krebs cycle is the process of breaking down pyruvate into acetyl-CoA, which is then used to produce ATP.

What is the role of oxidative phosphorylation in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option: B
Explanation:

Oxidative phosphorylation is the process of producing ATP from NADH and FADH2.

What is the net gain of ATP from one molecule of glucose during cellular respiration?

  1. 2

  2. 36

  3. 38

  4. 40


Correct Option: C
Explanation:

The net gain of ATP from one molecule of glucose during cellular respiration is 38.

What is the role of NADH and FADH2 in cellular respiration?

  1. To carry electrons

  2. To produce ATP

  3. To generate NAD+ and FAD

  4. To release carbon dioxide


Correct Option: A
Explanation:

NADH and FADH2 carry electrons from glycolysis and the Krebs cycle to the electron transport chain.

What is the role of the electron transport chain in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option: B
Explanation:

The electron transport chain is the process of producing ATP from NADH and FADH2.

What is the role of ATP in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option:
Explanation:

ATP is the energy currency of the cell and is used to power cellular processes.

What is the role of carbon dioxide in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option: D
Explanation:

Carbon dioxide is a waste product of cellular respiration and is released from the cell.

What is the role of water in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option:
Explanation:

Water participates in the Krebs cycle, where it is used to form acetyl-CoA.

What is the role of oxygen in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option:
Explanation:

Oxygen participates in oxidative phosphorylation, where it is used to accept electrons from the electron transport chain.

What is the role of mitochondria in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option:
Explanation:

Mitochondria house the Krebs cycle and oxidative phosphorylation, which are the two main stages of cellular respiration.

What is the role of the cytosol in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option:
Explanation:

The cytosol houses glycolysis, which is the first stage of cellular respiration.

What is the role of the plasma membrane in cellular respiration?

  1. To break down glucose into pyruvate

  2. To produce ATP

  3. To generate NADH and FADH2

  4. To release carbon dioxide


Correct Option:
Explanation:

The plasma membrane transports glucose and oxygen into the cell, which are necessary for cellular respiration.

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