Compare anaerobic and aerobic respiration including the two types of fermentation

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thilina-g eNotes educator| Certified Educator

Aerobic respiration is the process which takes place in the presence of oxygen. Aerobic respiration breaks down glucose and other substrate molecules(like fatty acids and amino acids) to extract energy.

Aerobic respiration can be summarized as below.

Glucose + O2 ------->CO2 +H2O + Energy

Aerobic respiration is a process with high yield that during the entire process 38 ATP molecules are produced. The main three steps of aerobic respiration are glycolysis, pyruvate oxidation and kreb's cycle.

As opposed to aerobic respiration, anaerobic respiration takes place where there is no oxygen. This is a special kind of respiration that normal cells undergo when there is no enough oxygen. Instead of oxygen, this process uses other inorganic molecules to produce ATP out of glucose.

The production of energy via anaerobic respiration can of either of the following ways.

Glucose ------> C2H5OH + CO2  +Energy

Glucose -------> Lactic acid + CO2 + Energy

But when compared to the yield of 38 ATPs in aerobic respiration, anaerobic respiration produces only 2 ATP molecules. Thus it is a very low yielding process.


Anaerobic fermentation of glucose  produces ethanol with low yield of cell mass. But lactic acid bacteria can produce lactic acid with hydrogen in place of ethanol while methanogenic bacteria will produce methane and hydrogen.

In the presence of oxygen, the aerobic fermentation of glucose will further convert ethanol into CO2  and H2O yielding in higher energy. This results in higher cell growth but lesser ethanol formation.

Glucose -------> Ethanol + CO2 (Anaerobic fermentation)

Ethanol ----> CO2 + H2O (In the presence of O2)



pranitingale | Student

ANAEROBIC RESPIRATION:- it is the type of respiration in which energy is produces in the absence of oxygen.

glucose ------>lactic acid +co2 + energy

here very small amount of energy is releasd which is only 2 ATPs.glucose is converted into pyruvate and then into lactic acid and energy in cytoplasm itself.

AEROBIC RESPIRATION:- it is the type of respiration in which energy is produced in the presence of oxygen.

glucose------->co2 + H2O +energy

here considerable amount of energy needed for various activities is generated which is 38 ATPs. glucose is converted into pyruvate and then energy is released in mitochondria with carbondioxide and water.

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