14 Questions
What is the net ATP gain from glycolysis?
2 ATP
What is the byproduct of pyruvate oxidation in the Krebs cycle?
Citric acid
How many ATP molecules are generated from one FADH2 molecule in the electron transport chain?
2 ATP
What is the purpose of Coenzyme A in the Krebs cycle?
To combine with pyruvate to form citric acid
How many NADH molecules are generated from one pyruvate molecule in the Krebs cycle?
3 NADH
What is the total ATP yield from the electron transport chain?
34 ATP
What is the characteristic of glycolysis in terms of oxygen presence?
Aerobic
The process of glycolysis is aerobic, meaning it requires oxygen.
True
Pyruvate molecules each have 4 carbons.
False
The Krebs cycle produces 2 ATP molecules.
False
Coenzyme A is a 3-carbon chain.
False
One pyruvate molecule produces 2 NADH and 1 FADH2 in the Krebs cycle.
False
The electron transport chain generates ATP through a process called ATPase.
False
The total ATP yield from all three processes of cellular respiration is 36 ATP.
False
Study Notes
Cellular Respiration
- Cellular respiration is the process of converting glucose into ATP through three stages: Glycolysis, Krebs Cycle, and Electron Transport Chain.
Glycolysis
- Breaks down glucose into 2 pyruvate molecules, each with 3 carbon atoms
- Anaerobic process, meaning it does not require oxygen
- Requires 2 ATP to initiate the process
- Net gain of 2 ATP and 2 NADH molecules
Krebs Cycle
- Aerobic process, meaning it requires oxygen
- Pyruvate molecules are oxidized, releasing one carbon atom
- Coenzyme A (2-carbon chain) combines with the remaining pyruvate to form citric acid (6-carbon molecule)
- NAD+ and FAD pick up electrons from pyruvate, generating NADH and FADH2
- 1 pyruvate molecule yields 3 NADH and 1 FADH2 molecules
- Total yield: 6 NADH and 2 FADH2 molecules
Electron Transport Chain
- NADH and FADH2 from the Krebs cycle are used to generate ATP
- ATP synthase produces ATP from the energy released by the electron transport chain
- 1 NADH molecule generates 3 ATP molecules
- 1 FADH2 molecule generates 2 ATP molecules
- Total ATP yield: 34 ATP molecules
Total ATP Yield
- Glycolysis: 2 ATP
- Krebs Cycle: 2 ATP
- Electron Transport Chain: 34 ATP
- Total: 38 ATP molecules
This quiz covers the three stages of cellular respiration: Glycolysis, Krebs Cycle, and Electron Transport Chain, explaining the process of converting glucose into ATP.
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