LIFE SCIENCE

Detailed explanation-1: -There are three main steps of cellular respiration: glycolysis, the citric acid cycle, and oxidative phosphorylation.

Detailed explanation-2: -Cellular respiration has three main stages: the glycolysis, the Krebs cycle, and the Electron transport chain. Whereas the glycolysis and the Krebs cycle result in a net gain of 2 ATPs each, the bulk of the ATP is produced during the last stage (Electron transport chain), which results in up to 34 more ATP molecules.

Detailed explanation-3: -Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP. The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation.

Detailed explanation-4: -Answer and Explanation: The three metabolic pathways which pyruvate can take at the end of glycolysis are lactic acid fermentation if there is oxygen absent, the Krebs cycle if there is oxygen present, and ethanol fermentation if there is oxygen absent.

Detailed explanation-5: -The three stages of aerobic cellular respiration are glycolysis (an anaerobic process), the Krebs cycle, and oxidative phosphorylation.