Q. 24.0( 173 Votes )

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

Answer :

Glucose is a six carbon molecule that is metabolised in different ways.
In different organisms, glusoce is broken down in the cytoplasm first giving rise to pyruvate which is a three carbon molecule.
This pyruvate will now be utilised differently by different organisms.


There are three pathways of glucose breakdown:


1. Anaerobic
2. Aerobic
3. Lack of oxygen


Anaerobic
pathway:

  • Takes place when oxygen is absent.
  • Pyruvate gets converted into ethanol and carbon dioxide.
  • Example: Yeast during fermentation.

Aerobic pathway:

  • Takes place in the prsence of oxygen.
  • Pyruvate is broken down into carbon dioxide and water.
  • Higher amoung of energy produced.
  • Example: In mitochondria.
Lack of Oxygen:

  • This state may be reached due to vigorous activity.
  • Oxygen is lacking and pyruvate gets converted into Lactic acid.
  • Accumulation of lactic acid leads to muscle cramps.
  • Example: In human muscle cells.




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