Photosynthesis: Part I : Photosynthesis: Part I
Photosynthesis : Photosynthesis Uses the energy from the sun
Converts to chemical energy
Stored in sugars
Anabolic process
Life on Earth is solar powered! : Life on Earth is solar powered!
Photosynthesis : Photosynthesis Takes place
in
chloroplasts
Photosynthesis : Photosynthesis 2. Light Independent Reactions
AKA
Calvin Cycle TWO STAGES:
1. Light Dependent Reactions
AKA Light Rxns
Light Dependent Rxns : Light Dependent Rxns Occurs in the thylakoid membrane of the chloroplast
Photophosphorylation
Uses light energy to make ATP
Electron transport
Light Dependent Rxns : Light Dependent Rxns Sunlight energy converted to ATP
Water is split
Coenzyme NADP+ is reduced to NADPH
Calvin Cycle : Calvin Cycle Carbon Fixation
Incorporates CO2 from the atmosphere into organic compounds
Uses the ATP and NADPH made in the light reactions to power carbon fixation.
Calvin Cycle : Calvin Cycle ATP donated to make glucose
Water provides the Hydrogen for glucose
Hydrogens carried to Calvin cycle by NADPH
CO2 provides the carbon and oxygen to make glucose
Products of Photosynthesis : Products of Photosynthesis Sugar CO2 Water
Chlorophyll a and b : Chlorophyll a and b Absorbs photons from sunlight
Absorbs light in the blue and red wavelengths
Reflects Green
Slide 15: Action Spectrum =
the rate of photosynthesis
vs. wavelength
Engelmann’s Experiment : Engelmann’s Experiment 1883
Theodor Engelmann
Filamentous algae exposed to spectrum
Used aerobic bacteria to tell where the most O2 is being produced.
Other pigments… : Other pigments… Carotenoids
Reflects orange/red light
Phycobilins
Reflects red/blue light
Absorbs green & orange light
Slide 29: Show Light Reactions animation
Photosynthesis animations : Photosynthesis animations http://highered.mcgraw-hill.com/sites/0072437316/student_view0/chapter10/animations.html#
Nice animation of cyclic vs. noncyclic paths
http://www.fw.vt.edu/dendro/forestbiology/photosynthesis.swf
Helps separate out the various parts of the “three ring circus”
Photosynthesis animations : Photosynthesis animations http://www.sumanasinc.com/webcontent/anisamples/majorsbiology/harvestinglight.swf (cartoon shows how electrons get excited and then replaced)
http://www.stolaf.edu/people/giannini/flashanimat/metabolism/photosynthesis.swf (shows how cytochromes work – quick)
Slide 35: Watch Calvin Cycle animation
Slide 42: Green machine