AP BIOLOGY

Detailed explanation-1: -Anabolic pathways are those that require energy to synthesize larger molecules.

Detailed explanation-2: -The synthesis of the many molecules needed by cells needs the input of energy to occur. Cells overcome this energy obstacle by using ATP to “drive” the reaction (Figure 6.3. 6). The energy needed to drive reactions is harvested in very controlled conditions in enzymes.

Detailed explanation-3: -Anabolic reactions, or biosynthetic reactions, synthesize larger molecules from smaller constituent parts, using ATP as the energy source for these reactions.

Detailed explanation-4: -Adenosine triphosphate (ATP) is the source of energy for use and storage at the cellular level. The structure of ATP is a nucleoside triphosphate, consisting of a nitrogenous base (adenine), a ribose sugar, and three serially bonded phosphate groups.

Detailed explanation-5: -Particularly significant is that they perform chemical work as they grow: many biomolecules consist of arrangements of matter that contain more useful energy than the materials these molecules are constructed from, and therefore energy is needed to synthesize them.