AP BIOLOGY

Detailed explanation-1: -Glycolysis (see “Glycolysis” concept) is an anaerobic process-it does not need oxygen to proceed. This process produces a minimal amount of ATP. The Krebs cycle and electron transport do need oxygen to proceed, and in the presence of oxygen, these process produce much more ATP than glycolysis alone.

Detailed explanation-2: -Glycolysis can happen in the presence or absence of oxygen.

Detailed explanation-3: -In the absence of oxygen, glycolysis is the only option that cells have for the production of ATP from glucose. Overproduction of lactic acid by anaerobic glycolysis leads to lactic acidosis, a life-threatening condition.

Detailed explanation-4: -Glycolysis produces 2 ATP per glucose molecule, and thus provides a direct means of producing energy in the absence of oxygen. This process of breaking down glucose in the absence of oxygen is aptly named anaerobic glycolysis.[1]