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. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation.

Detailed explanation-2: -Cellular respiration that proceeds in the absence of oxygen is anaerobic respiration. Cellular respiration that proceeds in the presence of oxygen is aerobic respiration.

Detailed explanation-3: -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-4: -Metabolic processes that require oxygen are called aerobic. Metabolic processes that do not require oxygen are called anaerobic.