Summary
Respiration is a biological process where cells convert glucose into energy in the form of ATP, either aerobically or anaerobically.
- Mitochondria — rod-shaped organelles where aerobic respiration occurs. Example: Mitochondria have cristae that increase surface area for reactions.
- Aerobic Respiration — process of producing cellular energy involving oxygen. Example: It includes glycolysis, the link reaction, Krebs cycle, and oxidative phosphorylation.
- Anaerobic Respiration — energy production in the absence of oxygen. Example: Yeast uses ethanol fermentation, while muscle cells use lactate fermentation.
- NAD and FAD — coenzymes that carry hydrogen atoms during respiration. Example: They are reduced during glycolysis and the Krebs cycle, then oxidized in the electron transport chain.
- Energy Yield — the amount of ATP produced from respiration. Example: Aerobic respiration yields significantly more ATP than anaerobic respiration.
Exam Tips
Key Definitions to Remember
- Mitochondria
- Aerobic Respiration
- Anaerobic Respiration
- NAD and FAD
Common Confusions
- Confusing the stages of aerobic respiration
- Misunderstanding the role of oxygen in respiration
Typical Exam Questions
- What is the role of mitochondria in respiration? Mitochondria are the site of aerobic respiration.
- How does anaerobic respiration differ from aerobic respiration? Anaerobic respiration occurs without oxygen and produces less ATP.
- What happens during the Krebs cycle? Acetyl CoA is converted into CO2 and reduced coenzymes.
What Examiners Usually Test
- Understanding of the stages of respiration
- Differences in energy yield between aerobic and anaerobic respiration
- The role of coenzymes in respiration