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What is cellular respiration ?
is the set of the metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate(ATP), and then release waste products.

What is aerobic respiration?
Aerobic respiration requires oxygen in order to generate energy (ATP). Although carbohydrates, fats, and proteins can all beprocessed and consumed as reactants, it is the preferred method of pyruvate breakdown in glycolysis and requires that pyruvate enter the mitochondrion in order to be fully oxidized by the Krebs cycle.The product of this process is energy in the form of ATP (adenosine triphosphate), by substrate-level phosphorylation, NADH and FADH2
Glycolysis
Glycolysis is a metabolic pathway that takes placein the cytosol of cells in all living organisms. This pathway does not require oxygen, and can therefore function under anaerobic conditions. The process converts one molecule of glucose into twomolecules of pyruvate (pyruvic acid), generating energy in the form of two net molecules of ATP. Four molecules of ATP per glucose are actually produced; however, two are consumed as part of thepreparatory phase. The initial phosphorylation of glucose is required to destabilize the molecule for cleavage into two pyruvate. During the pay-off phase of glycolysis, four phosphate groups are transferred toADP by substrate-level phosphorylation to make four ATP, and two NADH are produced when the pyruvate are oxidized. The overall reaction can be expressed this way:
Glucose + 2 NAD+ + 2 Pi + 2 ADP → 2pyruvate + 2 NADH + 2 ATP + 2
Fermentation
Without oxygen, cellular respiration could not occur because oxygen serves as the final electron acceptor in the electron transport system. The electrontransport system would therefore not be available.
Glycolysis can occur without oxygen. Although glycolysis does not require oxygen, it does require NAD+. Cells without oxygen available need to...