Aerobic Respiration

Question 1

Stages of Aerobic Respiration?

Answer 1

• Glycolysis (cytoplasm)
• Link Reaction (mitochondrial matrix)
• Krebs Cycle (mitochondrial matrix)
• Oxidative Phosphorylation (mitochondrial inner membrane - cristae)
• produces ATP

Question 2

What is Glycolysis?

Answer 2

• 1st stage of Aerobic and anaerobic respiration
  1. Phosphorylation of glucose to glucose phosphate, using ATP
  2. Production of TP
  3. Oxidation of TP to produce pyruvate with a net gain of ATP and reduced NAD

Question 3

What is the Link Reaction?

Answer 3

• pyruvate and NADH actively transported to mitochondrial matrix
• pyruvate oxidised to acetate
• NAD picks up hydrogen and becomes reduced NAD
• acetate combines with coenzyme A - Acetylcoenzyme A

Question 4

Krebs Cycle?

Answer 4

• AcetylCoA reacts with 4V molecule releasing CoA and producing a 6C molecule
• series of redox reactions - generates reduced coenzymes and ATP by substrate level phosphorylation and CO2 is lost
• 3x reduced NAD, 1x reduced FAD, 1x ATP, 2x CO2

Question 5

Oxidative Phosphorylation?

Answer 5

• most ATP made during this stage
• electron transfer chain
• movement of protons across cristae
• catalysed by ATP synthase