Biology 1002B Lecture Notes - Wild Type, Pyrenoid, Burping

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Published on 16 Apr 2013
School
Western University
Department
Biology
Course
Biology 1002B
Professor
Biology 1002B
Lecture 1
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Chlamydomonas “a sexually active, light harvesting carbon reducing, hydrogen belching planimal
Pyrenoid: is the center of carbon fixation in Chlamydomonas
Eyespot has no photosynthesis property, but it has an orientation function
Evolution of Complexity
How do we define complexity?
Latin, Complexus …. Entwined, twisted together
Ways to measure complexity
By size (length, volume)
Looking at genome size (C value enigma (paradox))
Looking at PCG (protein coding genes)
Multicellularity (differentiation into different types of cells, having different functions)
Phototaxis
Moving away/towards the light
Two samples of chlamy, one is wild type and it seems to be running way from the light, (buildup of too
much of free radicals) photon has lots of energy, it can denature proteins, photon can denature the
photosynthetic processes, does not want to absorb too much energy
Eyespot measures how much light/energy the cell needs
The eye and the eyespot can be traced back in time to find a common ancestor,
Are they homologous?
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Document Summary

Chlamydomonas a sexually active, light harvesting carbon reducing, hydrogen belching planimal. Pyrenoid: is the center of carbon fixation in chlamydomonas. Eyespot has no photosynthesis property, but it has an orientation function. Looking at genome size (c value enigma (paradox)) Multicellularity (differentiation into different types of cells, having different functions) Eyespot measures how much light/energy the cell needs. The eye and the eyespot can be traced back in time to find a common ancestor, Rods and cones are modified neurons and they sit on the retina, they are photosensitive (photoreceptive cell) 6million cones and 120 million rods in the eye. Photoreceptor binds a pigment, and it changes its shape from cis-retinal -> trans-retinal creates g protein. There is a sodium channel in the outer membrane of the photoreceptor cell. When sodium channel is closed, it hyperpolarizes the membrane, higher voltage, it cases an electrical current to go down the channel.

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