Photosystem II

Definition

Photosystem II is the first protein complex in the light-dependent reactions of oxygenic photosynthesis. It captures photons and uses the energy to extract electrons from water molecules.

Analogy

Think of Photosystem II as a solar-powered water pump. The sunlight (photons) powers the pump, which then pulls up water (extracts electrons from water molecules).

Related terms

Photon: A photon is a particle representing a quantum of light or other electromagnetic radiation. It's like a tiny packet of sunlight.

Light-Dependent Reactions: These are reactions in photosynthesis that convert light energy into chemical energy (ATP and NADPH). They're like charging your phone with solar power - converting sunlight into usable energy.

Oxygenic Photosynthesis: This is photosynthesis that produces oxygen through the splitting of water. It's like an eco-friendly factory that takes in water and sunlight, and outputs oxygen and sugar!