Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

11. Aerobic Respiration

Citric Acid Cycle

Cell Biology

11. Aerobic Respiration

Citric Acid Cycle

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Multiple Choice

The citric acid cycle requires oxygen indirectly, because oxygen is necessary for what to occur?

Replace FADH

Replace GDP

Replace ADP

Replace NAD+

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Verified step by step guidance

Understand that the citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats, and proteins into carbon dioxide.

Recognize that the citric acid cycle itself does not directly use oxygen. However, it is closely linked to the electron transport chain, which does require oxygen.

Identify that NAD+ is a crucial coenzyme in the citric acid cycle. It acts as an electron carrier, accepting electrons and becoming reduced to NADH.

Realize that NADH produced in the citric acid cycle is used in the electron transport chain, where it donates electrons. Oxygen is the final electron acceptor in this chain, allowing the regeneration of NAD+ from NADH.

Conclude that without oxygen, the electron transport chain cannot function, leading to a shortage of NAD+, which is necessary for the citric acid cycle to continue. Thus, oxygen is indirectly required to regenerate NAD+ for the cycle.