Question

Explain the process of breakdown of glucose in a cell 1 in the presence of oxygen and 2 in the absence of oxygen

Answer 1

(i) In the presence of oxygen- When breakdown of glucose is carried out in the presence of oxygen in a cell, it is called as aerobic respiration. Glucose is converted into a 3 carbon molecule called pyruvate which further breaks down in the presence of oxygen to form carbon dioxide and water. Energy is released in this process.

(ii)In the presence of oxygen- When breakdown of glucose is carried out in the Absence of oxygen in a cell, it is called as anaerobic respiration.Glucose is converted into a 3 carbon molecule called pyruvate which further breaks down in the absence of oxygen to give lactic acid and ethyl alcohol. This process is called fermentation.

Answer 2

Answer:

The process of breakdown of glucose in an exceeding cell is as follows:

The first step within the breakdown of glucose both in presence of O2 and in absence of O2 is the same. during this step, glucose is weakened into pyruvate. The second step which involves the further breakdown of personal into simple compounds can occur in two different ways:

(a) In presence of O2: Within the presence of O2, private is converted into CO2 and water. The energy released during aerobic respiration is far greater than that released during anaerobic respiration.

(b) In absence of O2:  Within the absence of O2 in yeast, pyruvate is converted into ethanol and CO2 and also the process is termed fermentation. In absence of O2, in our muscle cells, pyruvate is converted into a carboxylic acid. The build of carboxylic acid in muscle cells causes cramps.

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