BY4.2 Aerobic Respiration

Respiration is a series of anzyme catalysed reactions that releases energy from organic molecules (e.g. glucose) in order to synthesise ATP

Glycolysis:

• takes place in the cytoplasm
• no oxygen is needed

• glucose enters the cell
• hexokinase transfers one phospahte group from 2 ATP molecules to glucose
  • glucose can't leave the cell as the membrane is impermeable to ions
• hexose splits into 2 triose sugars
• each riose phosphate is dehyrodegenated in otder to reduce NAD into NADH
• each gives out enough energy to from 2 ATP molecules through substrate level phosphorylation
• 2 pryruvate molecules are formed
• there is a net gain of 2 ATP molecules

Link Reaction:

• pyruvate diffuses into the mitochondrial matrix

• each pyruvate molecule is decarboxylated and dehydrogenated to produce NADH and CO2
• coenzyme A and acetate join to form acetyl coenzyme A

Krebs…