Biology 1202B Lecture Notes - Accessory Pigment, Photosystem Ii, Photosystem I
19 Apr 2013
School
Department
Course
Professor
Document Summary
Photosynthesis history: autotroph self feeding, don"t eat other organisms, energy source is light, heterotroph eat other organisms as food source. Pigments excess light: van helmont grew a 5 lb. willow to 200 lb. , soil lost 2 oz. (conclusion: weight came from water) Joseph preisstley noted that if plant was in a container with no oxygen, o2 would be replenished. Absorption spectrum: measures % absorption of a particular pigment/compound vs. particular, measured by spectrophotometer in the lab (proteins absorb 280, nucleic wavelength of light acids = 260) Light dependent reactions (thylakoid membrane: stomata are opening sued to bring in co2 and remove o2, when excited, an electron has more potential energy and when it falls it releases this as heat/light. In chloroplasts, the electrons are not allowed to fall because they need to use the potential energy. Nadph nicotinamide-adenine-dinucleotide: electron acceptor in enzymatic removal of hydrogen ions from specific substrates.
