BI110 Lecture Notes - Lecture 28: Action Spectrum, Amyloplast, Picea Engelmannii

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8 Dec 2016
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Inner membrane: like the matrix of mitochondria. Thylakoid: 3rd membrane system, photosynthesis starts here, contain a 3rd soluble compartment called thylakoid lumen. Leaves form chloroplasts because they are in light. Roots have plastids amyloplasts: store starch. Fruits have plastids chromoplasts: filled with pigments that colour the fruits. After excitation, one of three events occur: e- returns to ground state and energy is emitted, e- returns to ground state and energy transfers to another pigment: inductive resonance, excited e- transferred to an acceptor photoreduction. Chlorophyll absorbs blue and red wavelengths most strongly. Chlorophylls and carotenoids work together to absorb photons during photosynthesis: allow for a wider range of light wavelengths to be absorbed. Action spectrum is a sum of all the pigments. A glass prism breaks up a beam of light into a spectrum of colours, which are cast across a microscope slide.

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