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Org Phys Lect sept 27.docx

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Biology 2601A/B

Org Phys Lect Sept 27 The vast majority of organisms on the earth are using sunlight Photosynthesis is the most important biological process on earth This pic is chlorophyll concentrations on the earth Photosynthesis and everything takes up this stupic number of carbon per year Graph slide The keeling curve Atmospheric co2 concentration vs year Looked for a place that was very isolated, no large scale inductrail processes Since the 1960s the co2 concentration has risen Annual cycle that occurs; in the winter months theres an increase in co2, decrease in late summer This is planetary breathing Comparing the efficiency of solar radiation looking at how plants do it Light – energy High energy types of light (gamma rays and x rays) Visible spectru, (area of light photosynthesis uses) Pigments If a chlorophyll molecule that’s in its ground state absorbs blue light and gets excited, goes to lower level by releasing heat Peak over on the right side on the amount of absorbed energy Chlorophyll looks green because the wavelegths it is absorbing are in the green area Pigments are molecules that absorb photons, they are the colour of the wavelengths they are reflecting Absorption spectrum of a leaf Catching light Chlorphplats Double membrane, inside inner envelope is the stroma, and there are grana lemelae, stacks of thylakoids are in them, stacks of thylakoids held together by grana are connected by highway things called (?) Bottom left pic- each of those circles is a chloroplast Botto, right; chloroplasts try to minimize their exposure to light when the light is coming straight down on them Nrg rom harvested photons… Hair of chlorphylls in the middle, Area in the antennae complex that is reserved for energy Energy can be passed along from pigment to pigment to pigment unyil it gets to the reaction center Strip electron off the donor send it to the receptor Reaction center is where transfer of electrons happens Two sets of reactions In photosynthesis Light dependent:
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