What do NADP and ADP stand for?

NADP - Nicotinamide Adenine Dinucleotide Phosphate

• Function: Acts as an electron and hydrogen carrier in photosynthesis
• Forms: Exists as NADP⁺ (oxidized form) and NADPH (reduced form)
• Role: NADPH produced during light reactions serves as a reducing agent in the Calvin cycle, providing hydrogen and high-energy electrons for CO₂ reduction to form glucose
• Structure: Contains nicotinamide, ribose sugar, phosphate groups, and adenine

ADP - Adenosine Diphosphate

• Function: Energy currency precursor in cells
• Forms: Converts to ATP (Adenosine Triphosphate) when a phosphate group is added
• Role: During photosynthesis, ADP is phosphorylated to ATP in the light reactions through photophosphorylation, storing energy that powers the Calvin cycle
• Structure: Composed of adenine (nitrogenous base), ribose (5-carbon sugar), and two phosphate groups

Importance in Photosynthesis:

Both molecules are essential products of the light-dependent reactions and are consumed in the light-independent reactions (Calvin cycle). ATP provides the energy, while NADPH provides the reducing power necessary to convert CO₂ into glucose. Together, they form the crucial link between the light and dark reactions of photosynthesis.