January 8, 2013
Light: Energy and Information
Chlamydomonas: sexually active, light-harvesting, carbon-reducing hydrogen-
belching planimal. Green algae.
Organelles in Chlamydomonas:
Nucleus Just one, similar to animal cells
Basal body at the base of flagellum, where microtubules develop to produce
Chloroplast One single chloroplast
Pyrenoid here carbon fixation takes place, in chloroplasts.
Eyespot rich in carotenoid pigment, found in chloroplast, nothing to do with
photosynthesis, enables cell to orientate itself towards light needed for
Carbon Fixation: Reduction of inorganic carbon to organic compounds by living
Evolution of Complexity:
- entwined, twisted together
- more than one entity that comes together
- ex: protein complex where several proteins come together
- more complex, more things coming together
Chlamy is much larger (more complex) than E.Coli. Why?
- Genome size?
- PCG (Protein coding genes)
What determines complexity?
Evolution of Multicellularity:
- Same species with different levels of multicellularity
- Volvox: very multic