3.7.3 Explain that, during anaerobic cell respiration,

pyruvate can be converted in the cytoplasm into lactate, or

ethanol and carbon dioxide, with no further yield of ATP

•Anaerobic respiration is the oxidation of organic compounds without oxygen.•It is less efficient than aerobic respiration (with oxygen).•There are different types of anaerobic respiration. Here we will compare anaerobic respiration in yeast and humans.

Humans anaerobic respiration:

• Location: cytoplasm• Substrate: Glucose• Product: lactic acid (lactate)

+ ATP

Yeast anaerobic respiration:

• Location: cytoplasm• Substrate: Glucose• Product: Ethanol + carbon dioxide + ATP

Task:

1. Complete the assessment statement on page 47 (3.7.4).

2. Copy the diagram into your notes.3. Use your notes to :• Find out where glycolysis takes place.• How many molecules of ATP are produced

during glycolysis.• Explain how pyruvate gets into the

mitochondria.• Explain what is meant by oxidation and

reduction.