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: -Aerotolerant organisms do not require oxygen as they metabolize energy anaerobically. Unlike obligate anaerobes, however, they are not poisoned by oxygen.

Detailed explanation-3: -Anaerobic stands for “without oxygen.” This method of cellular respiration does not require oxygen to generate energy. For smaller animals to breathe, there is not enough oxygen available so they need the energy to survive in the absence of oxygen.