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organismal phys

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Biology 2601A/B
Brent Sinclair

Sept 2911 CO2 is high in winter due to less photosynthesis It is low in fall Photosynthesis is the most important biological process on earth 165 billion tonnes of carbon is taken from the air and put into plants each year Photosynthesis is efficient Plants produce no net carbon absorption There is no carbon cost for having plants Light is a particle and a wave and contains energy Short wavelength high frequency light has high energy content Pigments are molecules that absorb photons Pigments are found in the chloroplast Chlorophyll is a type of pigment that absorbs red and blue light The wavelengths on the absorption spectra reflect the colour of light absorbed Absorption of the photon increases the energy level of the molecule Photosynthesis is driven by absorption The absorption spectrum of a leaf and the plot of the relative rate of photosynthesis are the same or equal when the pigment used to obtain the absorption spectrum is the same as that which causes the response photosynthesis Leaves are photosynthetic organisms Chloroplasts are located within leaves The epidermis of the leaf reflects light and transfers it to the chloroplast The stroma surrounds the thylakoid membranes and contains enzymes that catalyze carbon fixation Pigments found within chloroplast are what absorb the light needed to power photosynthesis The pigment chlorophyll a has an Mgcontaining porphyrin ring Energy from harvested photons is transferred to the reaction centre by inductive resonance This happens in the stroma of chloroplast A photon of light hits the light harvesting complex which is the pigment molecules and the energy is transferred along until it reaches the reaction centre The light harvesting complex and the reaction centre together make up the photosystem Many pigments together serve as an antenna collecting light and transferring its energy to the reaction centre where chemical reactions store some of the energy by transferri
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