Question

What are the different ways in which glucose is oxidized to provide energy in various organisms?

Answer 1

1) Aerobic respiration : In this case pyruvate is broken down into water and carbon dioxide along with release of energy. It commonly occurs in mitochondria of cells.
2) Anaerobic respiration in yeast : In yeast cells during fermentation pyruvate is converted into ethanol and C02 in the absence of 02.
3) Anaeorbic respiration in muscles: Due to lack of oxygen, eg. during vigorous running or exercise, in human muscles, pyruvate is converted to lactic acid.
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Answer 2

Glucose is oxidized anaerobically and aerobically. In anaerobic respiration less amount of energy is released where as in aerobic respiration more amount of energy is released. Anaerobic respiration occurs in some microorganisms and in muscles( during rapid exercise). Whereas aerobic respiration occurs in all higher organisms.