AP BIOLOGY

Detailed explanation-1: -adenosine triphosphate (ATP), energy-carrying molecule found in the cells of all living things. ATP captures chemical energy obtained from the breakdown of food molecules and releases it to fuel other cellular processes.

Detailed explanation-2: -Glucose and other food molecules are broken down by controlled stepwise oxidation to provide chemical energy in the form of ATP and NADH.

Detailed explanation-3: -Oxidative Phosphorylation This process generates most of the ATP we use-up to 27 for each molecule of glucose. As enzymes break apart the molecules from food, they transfer hydrogen atoms (made of a proton and an electron) to the carrier molecules FAD and NAD.

Detailed explanation-4: -The energy content of food is expressed as “calories” ("calories” are in reality kcal or kilocalories as defined in chemistry; 1 kcal will heat one liter of water one degree C).