Question

explain the mechanism of anaerobic respiration

Answer 1

oxygen is not required in this type of respiration this type of respiration is found in yeast ,bacteria ,parasites and some other lower animals which do not have access to atmospheric oxygen . In the absence of oxygen ,the glucose is converted into substances like ethyl alcohol or lactic acid and less amount of energy is released.this process is also known as sugar fermentation

Answer 2

★ Anaerobic respiration (Fermentation):

→ It is the incomplete oxidation of glucose under anaerobic condition.

→ It occurs in many prokaryotes and unicellular eukaryotes.

→ It as 2 types:-

• Alcoholic fermentation:- Here, the pyruvic acid formed from glucose is converted to CO2 and ethanol. The enzymes, pyruvic acid decarboxylase and alcohol dehydrogenase catalyse these reactions. E.g. Yeast.

Yeasts poison themselves to death when the concentration of alcohol reaches about 13%.

• Lactic acid fermentation:- Here, pyruvic acid is converted to lactic acid. E.g. Some bacteria.

→ The reducing agent (NADH+H) is reoxidised to NAD in both the processes.

→ In animals, when oxygen is inadequate during exercise, pyruvic acid in muscle cells is reduced to lactic acid by lactate dehydrogenase.

→ Net ATP production from fermentation of one glucose molecule = 2. (4 ATP from glycolysis - 2 ATP utilized).

★ Note:-

→ Steps involved in the fermentation are given in the attachment.