Notes 9-25-09

vi-why dont bacteria have mitochondria?
why do we have mitochondria to make atp?
how do mitochondria make atp?
-trap protons between membranes; but want to equalize concentration but cant get back in because charged particles cannot cross a hydrophobic layer-protons cross water wheel which spins and creates and atp
-they make atp by using electron passes down proteins embedded in membrane to pump protons across inner membrane to space between inner and outer membranes. Then since H+ are positively charged, so can't cross hydrophobic membranes just anywhere so protons fall across "water wheel" spins, adding 1 phosphate to adenosine— 3 falling proteins— 3 phospahtes added=1 atp
v-similarity to secretion systems (type 3)
these secretion systems are used to pump proteins outside of bacterial cells
ex: vivulence factor: pumped directly into host cells, protein that contributes to symptoms of disease, made by pathogenic bacteria
through time 3 secretion systems by some pathogenic bacteria
I-Exponential Growth vs. Logarithmic growth
-(number of bacteria at a given time)=2^x (x=number of generations since originally had 1 bacterium)

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