AP BIOLOGY

Detailed explanation-1: -Anaerobic respiration is a normal part of cellular respiration. Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen.

Detailed explanation-2: -Glycolysis requires no oxygen. It is an anaerobic type of respiration performed by all cells, including anaerobic cells that are killed by oxygen. For these reasons, glycolysis is believed to be one of the first types of cell respiration and a very ancient process, billions of years old.

Detailed explanation-3: -There are two types of cellular respiration (see Cellular Respiration concept): aerobic and anaerobic. One occurs in the presence of oxygen (aerobic), and one occurs in the absence of oxygen (anaerobic).

Detailed explanation-4: -Anaerobic respiration only involves glycolysis. This step produces 2 ATPs and does not need any oxygen. The electron transport chain needs oxygen. Since anaerobic respiration only involves glycolysis (which is an anaerobic step itself) it does not need oxygen.

Detailed explanation-5: -Fermentation does not require oxygen and is therefore anaerobic. Fermentation will replenish NAD+ from the NADH + H+ produced in glycolysis. One type of fermentation is alcohol fermentation.