AP BIOLOGY

Detailed explanation-1: -Oxygen and glucose are both reactants of cellular respiration. Oxygen enters the body when an organism breathes. Glucose enters the body when an organism eats.

Detailed explanation-2: -The reactants of cellular respiration are oxygen and sugar, which are the products of photosynthesis. Cellular respiration occurs in plant and animal cells. Plants use sunlight during photosynthesis to convert energy from the sun in order to manufacture sugar and the chemical energy ATP and to release oxygen.

Detailed explanation-3: -Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by-products and ATP is energy that is transformed from the process.

Detailed explanation-4: -The Krebs cycle is the second stage of cellular respiration, and cellular respiration is a series of stages or biochemical pathways that produces energy for the cell. Cellular respiration begins with a pathway called glycolysis where glucose is converted into a molecule called pyruvate.

Detailed explanation-5: -The reactions of cellular respiration can be grouped into three stages: glycolysis (stage 1), the Krebs cycle, also called the citric acid cycle (stage 2), and electron transport (stage 3).