Summary OCR A-Level Biology 5.7.1 Cellular Respiration

Cellular Respiration
Types of Respiration
Aerobic
 Glucose + Oxygen -> Carbon Dioxide + Water + Energy
 C₆H₁₂O₆ + O₂ -> 6CO₂ + 6H₂O + 36 ATP
Anaerobic
 Glucose -> Lactate (Lactic Acid) + Energy
 C₆H₁₂O₆ -> 2C₃H₆O₃ + 2ATP
Fermentation (Anaerobic Yeast)
 Glucose -> Carbon Dioxide + Ethanol + Energy
 C₆H₁₂O₆ -> 2CO₂ + 2C₂H₅OH + 2ATP



Stages of Respiration
 Glycolysis – breakdown of glucose
 Link Reaction – links glycolysis to the Krebs cycle
 Krebs Cycle –
 Oxidative phosphorylation –



Need for Respiration
 Active transport  DNA replication
 Endocytosis  Cell divison
 Exocytosis  Movement
 Synthesis of large molecules  Activation of chemicals


Anabolic – small to large molecules – synthesis
Catabolic – large to small molecules – hydrolysis