Biology, asked by simranjitsandhu9859, 9 months ago

Explain the process of breakdown of glucose in a cell 1 in the presence of oxygen and 2 in the absence of oxygen and 3 in lack of oxygen

Answers

Answered by kampri
4

Answer:

presence of oxygen is respiration

absence is glycolysis

lack is lactic acid fermentation and alcoholic dehyration

Answered by 6954treesa
1

Answer:

i. In the presence of oxygen : In all the pathways,  the first step in break down of glucose, a six -carbon  molecule, into a three-carbon molecule, called  pyruvate. This process occurs in the cytoplasm  of the cell. In aerobic respiration breakdown of  , pyruvate using oxygen takes place in mitochondria.  It breaks up the three-carbon pyruvate molecule to give three molecules of carbon dioxide, water  and lots of energy as compared to anaerobic  respiration.

ii. In the absence of oxygen: In the absence of  oxygen pyruvate may be converted into ethanol  and carbon dioxide which is referred to as  fermentation that takes place in yeast. Sometimes anaerobic respiration also occurs in our muscle cells, when there is lack of oxygen, i.e., during  vigorous muscular activities. At that time pyruvate is  converted into lactic acid which is also a three-carbon  molecule. This build-up of lactic acid in our muscles  causes fatigue or muscular cramps.

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