Biology 1002B Lecture Notes - Lecture 2: Electromagnetic Spectrum, Visual Phototransduction, Chlamydomonas
20 Mar 2016
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Document Summary
Cycle 1: trapping light for energy and information. Characteristics of chlamydomonas that make it a useful model system: simple, single cell system, both nuclear and chloroplast dna, small, reproduces and grows rapidly. Relatedness of chlamydomonas to plants and animals: chlamy diverged early on from other animals and plants but is classified as a plant. More closely related to plants than animals: has flagella (animal-related trait) and chloroplasts (plant-related trait) Relationship between genome size and protein coding genes: genome size is a bad indicator of complexity, pcg, protein-coding genes are a better measure of complexity. A larger genome has a higher possibility for pcgs but does not necessarily have more. Phototransduction from eyespot to flagella: eyespot triggers chlamy to move through the production of an action potential. Although simple, not primitive since it still exists: phototransduction. Outside of the cell is positive, inside is negative. Ca2+ and h+ can cross the membrane while open.
