Biology OCR f214 - Photosythesis

Autotroph: Organisms that use light energy and inorganic molecules to synthesise complex organic molecules

Heterotroph: Organisms that ingest and digest complex organic molecules, releasing their chemical potential energy stored in them

Light energy is used during photosynthesis to produce complex organic molecules

Organisms release the energy stored in complex organic molecules - respiration. Respiration requires O2, which was first released for plants during photosynthesis. Oce the atmosphere contained oxygen, organisms could use it for aerobic respiration

Photosynthesis is a 2-staged process that takes place in chloroplasts

The inner membrane has transport proteins and controls the entrance and exit of substances between stroma and cytoplasm

Grana provide large surface area for photosynthetic pigments, electron carriers, and ATP synthase

Photosyntheic pigments are arranged in photosystems

Proteins hold photosystems in place