Answer:
In the process of
respiration, the first step is the breakdown of glucose, a 6-carbonmolecule
breaks into 2 molecules of 3-carbon molecule called pyruvate. This process takes
place in the cytoplasm.
The subsequent
breakdown pathway depends on the absence or presence of oxygen as follows
(i) Aerobic
respiration it takes place in the mitochondria in the presence of oxygen. Pyruvic
acid is converted into carbon dioxide, and water thus releasing a lot of
energy.
(ii) Anaerobic
respiration It takes place in the cytoplasm in the absence of oxygen.
Pyruvic acid is
converted either into CO2 and ethanol (in case of microbes, i.e., fermentation
in yeast) or into lactic acid (in the case of muscle cells during sudden activity
in humans.)
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