Biology 1201A Chapter Notes - Chapter 1: Chlamydomonas, Phototaxis, Photon

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Eye spot is required for phototaxis; movement away or towards light. Chloroplast for photosynthesis. relative usefulness of various biological characteristics as measures of complexity: Most common use to measure complexity: # of different types of cells posessed by an organism. advantages to chlamydomonas in being phototactic. reasons why chlamydomonas might move away from a light source. Photons of light, there are lots of energy in a photon. If its very bright light its gonna back away bc it doesn"t want to absorb too much light. Phototaxis: towards and away. the eye spot is measuring the light-can gage how much light it needs. basic structure of rods and cones as photoreceptor cells. major components involved in phototransduction and their role: Proteins that sits on the membrane; binds a pigment. Hit by a photon of light and the shape of the photoreceptor changes. One photon causes transretinal. activates a protein called transducen which in turn activated an ez. (ends in ase).

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