Biology 1002B Lecture Notes - Exergonic Reaction, Photochemistry, Atp Hydrolysis
16 Mar 2013
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A eukaryotic cell is much bigger than a bacteria cell, so it should be more complex. Multicellularity is different tissues and different types of cells. Each of these green cells are of different species. The last one is volvox, it has 50, 000 cells. The cells like chlamy are found on the outside, they are somatic cells. Eyespot: this is required for phototaxis (movement towards or away from light). The eyespot just senses photons, it does not produce an image. Eyespot share a common ancestor, this is homology. For the eye, neurons sit on the retina. We have 6 million cones and 120 million rods. The photoreceptor gets hit by a photon of light. This in turn activates the enzyme phosphoditerase. This enzyme cleaves the 3" bond, the phosphate is only bound to the 5" position. There is a sodium channel on the outer membranes of the photo receptor cell. When you shut off sodium transportation it hyperpolarizes the membrane.
