AP BIOLOGY

Detailed explanation-1: -In light reactions, energy from the sunlight is absorbed by the pigment chlorophyll and is converted into chemical energy in the form of electron charge carrier molecules such as NADPH and ATP.

Detailed explanation-2: -Generating Another Energy Carrier: NADPH As the electron from the electron transport chain arrives at photosystem I, it is re-energized with another photon captured by chlorophyll. The energy from this electron drives the formation of NADPH from NADP+ and a hydrogen ion (H+).

Detailed explanation-3: -The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH.

Detailed explanation-4: -In the light reactions, energy from sunlight drives the synthesis of ATP and NADPH, coupled to the formation of O2 from H2O. In the dark reactions, so named because they do not require sunlight, the ATP and NADPH produced by the light reactions drive glucose synthesis.

Detailed explanation-5: -Related Biology Terms NADPH – The reduced version of NADP+, which serves as a proton donor and electron carrier. NADH – NADPH without an extra phosphate group, used mostly in catabolic reactions.