In computational complexity theory, a problem refers to the abstract question to be solved. In contrast, an instance of this problem is a rather concrete utterance, which can serve as the input for a decision problem. For example, consider the problem of primality testing.
Oxygen plays a vital role in both the aerobic and anaerobic metabolic systems. While oxygen is required as a direct energy source in the aerobic system, it is also essential in clearing the blood of excess lactic acid buildup in the anaerobic system.
When one glucose molecule is converted into lactic acid in anaerobic metabolism, three ATP molecules are generated. When a glucose molecule is converted into carbon dioxide and water via aerobic metabolism, it produces 39 molecules of ATP.However, glycolysis requires powerful enzymes that compensate for the lower energy efficiency of anaerobic metabolism. What limits the anaerobic process is the byproduct, or lactic acid.hen one glucose molecule is converted into lactic acid in anaerobic metabolism, three ATP molecules are generated. When a glucose molecule is converted into carbon dioxide and water via aerobic metabolism, it produces 39 molecules of ATP.