This preview shows page 1. Sign up to view the full content.
Unformatted text preview: PHOTOSYNTHESIS Some organismsplants and some microbeshave the ability to use light energy to synthesize complex organic substances (sugars) from simple inorganic substances. This is photosynthesis. Carbon dioxide gas is the source of the carbon, so this process is also called carbon fixation. 6 CO 2 +12 H 2 O + LIGHT ENERGY C 6 H 12 O 6 + 6 O 2 + 6 H 2 O Electrons are taken from water and incorporated into sugar. Energy from the sun is used. Two stages: 1. Light reactionslight energy is used to convert ADP and phosphate groups to ATP (photophosphorylation). NADP is reduced to NADPH. 2. Dark (light-independent) reactionselectrons from NADPH plus energy from ATP are used to reduce carbon dioxide to sugar (Calvin-Benson cycle)....
View Full Document
This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.
- Fall '09