AP BIOLOGY

Detailed explanation-1: -Stage two. A pyruvate molecule enters the mitochondria and is broken down in the presence of oxygen to produce carbon dioxide and water. Enough energy is released from each pyruvate molecule to produce a large number of ATP molecules.

Detailed explanation-2: -The stage that produces most of the ATP during cellular respiration is the electron transport system (ETS). The inner mitochondrial membrane holds the ATPase enzyme and the complexes for ETS.

Detailed explanation-3: -Glycolysis requires an input of glucose, two ATP, two ADP, and two NAD+. Reactants for pyruvate oxidation are pyruvate, NAD+, and coenzyme A (CoA).

Detailed explanation-4: -The second stage of cellular respiration, the Krebs cycle, takes place in the matrix. The third stage, electron transport, takes place on the inner membrane.

Detailed explanation-5: -During anaerobic respiration, only 2 molecules of ATP are produced during the first and essentially only step; glycolysis. The low ATP yield of glucose in fermentation occurs because the glucose molecule is not completely broken down, or metabolized.