Question

explain the process of breakdown of glucose in a cell in the presence of Oxygen and in the absence of oxygen​

Answer 1

Glucose is broken down into a three carbon molecule called pyruvate in the cell cytoplasm. Pyruvate is further broken down by different ways to provide energy in various organisms. Pyruvate is broken down in different ways in different organisms as shown below:

i.In yeast cells, during fermentation, pyruvate is converted into ethanol and carbon dioxide in the absence of oxygen.
ii. In mitochondria, breakdown of pyruvate takes place in presence of oxygen to give rise three molecules of carbon dioxide and water.
iii. Sometimes, when there is lack of oxygen, especially during vigorous activity, in our muscles, pyruvate is converted into lactic acid. Concept insight: Students should know various types of respiration.

Answer 2

Explanation:in presence of oxygen, Glucose breaks into carbon dioxide and water and releases 32 ATP energy. it is known as aerobic respiration.in absence of oxygen, Glucose breaks into ethyl alcohol or lactic acid with release of 2 ATP energy. this process is known as anaerobic respiration.. also known as fermentation.