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Lecture

Biology 2601A/B Lecture Notes - Mygrain, Keeling Curve, Photosynthetic Reaction Centre


Department
Biology
Course Code
BIOL 2601A/B
Professor
Prof

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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
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