What is respiration?

Respiration is the enzymatic release of energy from organic compounds in living cells.

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What are the four stages of aerobic respiration?

  1. Glycolysis - the splitting of glucose into pyruvate molecules
  2. Link reaction - the conversion of the pyruvate molecules into acetyl coenzyme A
  3. Krebs cycle - the conversion of acetyl coenzyme A into ATP, reduced NAD, and reduced FAD
  4. Oxidative phosphorylation - the use of the electrons, reduced NAD, and reduced FAD to produce ATP and water

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What is the original energy source for ATP?

For most organisms, the energy originates in sunlight, which is captured and transferred to chemical energy in organic molecules by photosynthesis.

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What are the two forms of cellular respiration?

  1. Aerobic respiration (requires oxygen)
  2. Anaerobic respiration (does not require oxygen)

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What is the main difference between aerobic and anaerobic respiration?

The main difference is that aerobic respiration requires oxygen while anaerobic respiration does not require oxygen.

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