Explain the ways in which glucose is broken down in absence of oxygen.
There are two ways of anaerobic breakdown of glucose. First step is breakdown of glucose molecule into pyruvate which takes place in cytoplasm.
The anaerobic breakdown in bacteria is called fermentation. During fermentation pyruvate is broken down to ethyl alcohol and carbon dioxide.
When there is lack of oxygen in our muscle cells pyruvate is broken down to lactic acid.
Very less amount of energy is released in both the above cases.