Biology 1002B Study Guide - Midterm Guide: Transmembrane Protein, Cytosol, Visual Phototransduction
24 Aug 2016
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Relatedness of chlamydomonas to plants and animals similar to plants in that it contains chloroplasts to produce energy through photosynthesis relates to eukaryotic plants and animals in that it contains a nucleus. Has the ability to move using flagella like other protista. Phototactic: ability to move away or towards light: negative if moving away, positive if towards light. An advantage to chlamy being phototactic is that it can give itself access to light which it needs to produce energy through photosynthesis. Reasons why chlamydomonas might move towards a light source. to gather information about its surroundings to undergo photosynthesis and produce energy in order to function. Reasons why chlamydomonas might move away from a light source. light becomes harmful if the cell harvests too much and creates ros (reactive oxygen species) which can be mutagenic. Possible mutations that could cause a chlamydomonas cell not to be phototactic. Mutation in channelrhodopsin, may inhibit an action potential preventing the flagella from moving.
