One way to divide prokaryotes is into aerobes and anaerobes. Aerobes are organisms that can survive and grow in the presence of oxygen while anaerobes did not require oxygen for survival and growth. All aerobes can produce ATP with or without oxygen (though they may need oxygen for survival. However some anaerobes are harmed by the presence of oxygen (obligate anaerobes). These anaerobes can produce ATP through glycolysis or anaerobic respiration, where another molecule besides oxygen is used as the final electron acceptor for the electron transport chain.

The pyruvate decarboxylation reaction is pyruvate+ CoA-SH+ NAD+ -> NADH+ CO2+ acetyl CoA.

The pyruvate decarboxylation reaction is pyruvate+ CoA-SH+ NAD+ -> NADH+ CO2+ acetyl CoA.

In cellular respiration, glucose first undergoes glycolysis and is broken down into two pyruvate molecules. As the pyruvate passes through the citric acid cycle, three molecules of are produced. The radioactive oxygen molecules would be found in the .

is formed when electrons removed from glucose are used to reduce . is produced by the phosphorylation of . The oxygen in enters the mitochondrion as gaseous molecular oxygen from the atmosphere, not from glucose. Finally, is reduced to water in cellular respiration and serves as a reactant, rather than a product, in cell metabolism.

The net production of ATP is 2.

This is because for glycolysis to occur, 2 ATP must be used. Glycolysis goes on to produce 4 ATP. The loss of 2 ATP and the gain of 4 ATP results in a total net gain of 2 ATP molecules. Note that the ATP produced during glycolysis are via substrate level phosphorylation.

Glycolysis is the first step of cellular respiration where glucose is broken down down into pyruvate. It occurs in the cytosol. In the presence of oxygen, pyruvate is exported to the mitochondria where it is further oxidized. In the absence of oxygen, pyruvate is converted into ethyl alcohol or lactic acid (fermentation) in the cytoplasm.

One way to divide prokaryotes is into aerobes and anaerobes. Aerobes are organisms that can survive and grow in the presence of oxygen while anaerobes did not require oxygen for survival and growth. All aerobes can produce ATP with or without oxygen (though they may need oxygen for survival. However some anaerobes are harmed by the presence of oxygen (obligate anaerobes). These anaerobes can produce ATP through glycolysis or anaerobic respiration, where another molecule besides oxygen is used as the final electron acceptor for the electron transport chain.

Glycolysis is the first step of cellular respiration where glucose is broken down down into pyruvate. It occurs in the cytosol. In the presence of oxygen, pyruvate is exported to the mitochondria where it is further oxidized. In the absence of oxygen, pyruvate is converted into ethyl alcohol or lactic acid (fermentation) in the cytoplasm.

The net production of ATP is 2.

This is because for glycolysis to occur, 2 ATP must be used. Glycolysis goes on to produce 4 ATP. The loss of 2 ATP and the gain of 4 ATP results in a total net gain of 2 ATP molecules. Note that the ATP produced during glycolysis are via substrate level phosphorylation.

In cellular respiration, glucose first undergoes glycolysis and is broken down into two pyruvate molecules. As the pyruvate passes through the citric acid cycle, three molecules of are produced. The radioactive oxygen molecules would be found in the .

is formed when electrons removed from glucose are used to reduce . is produced by the phosphorylation of . The oxygen in enters the mitochondrion as gaseous molecular oxygen from the atmosphere, not from glucose. Finally, is reduced to water in cellular respiration and serves as a reactant, rather than a product, in cell metabolism.