Biology 1002B Study Guide - Midterm Guide: Photosystem Ii, Photosystem I, Atp Synthase

• School: Western University
• Department: Biology
• Course: Biology 1002B
• Professor: Tom Haffie

Document Summary

Distinction between autotrophs and heterotrophs: autotroph: an organism that obtains its energy from sunlight to convert inorganic materials to organic materials, heterotroph: an organism that is unable to synthesize organic compounds from inorganic sources. It feeds on organic matter produced by other organisms. Two phases of photosynthesis: light reactions: captures light energy by pigments and utilizes that energy to synthesize nadph and atp. H2o is oxidized -> releases oxygen and electrons. Electrons are then used to reduce nadp+ to nadph: calvin cycle: electrons and protons carried by nadph and the energy of atp hydrolysis are used to convert co2 into carbohydrate. Carbon fixation reduction reaction with electrons and protons being added to co2. Atp hydrolysis -> supplies energy for the endergonic reaction. Nadph -> supplies the electrons to make the c-h bonds. Carbohydrates have more free energy due to their c-h bonds (neither are electronegative so its easy to remove electrons)