AP BIOLOGY

Detailed explanation-1: -Cellular respiration or respiration is the process by which cells breakdown glucose to release energy. Carbon dioxide and water are also released in the process. This can happen in the presence or absence of oxygen. When respiration takes place in the presence of oxygen, it is called aerobic respiration.

Detailed explanation-2: -Glycolysis is the process by which glucose is broken down within the cytoplasm of a cell to form pyruvate. Under aerobic conditions, pyruvate can diffuse into mitochondria, where it enters the citric acid cycle and generates reducing equivalents in the form of NADH and FADH2.

Detailed explanation-3: -During cellular respiration, a glucose molecule is gradually broken down into carbon dioxide and water. Along the way, some ATP is produced directly in the reactions that transform glucose. Much more ATP, however, is produced later in a process called oxidative phosphorylation.