Lecture 7 Flashcards
The electron transport system is oriented in the cytoplasmic membrane so that..
e- are separated from protons
electron carriers arranged in membrane in order of..
their reduction potential
The final carrier in the chain..
donates the e- and protons to the terminal electron acceptor
During electron transfer, from where do the protons released originate from?
NADH and the dissociation of water
the proton motive force
results in generation of pH gradient and an electrochemical potential
- inside becomes electrically negative and alkaline
- outside becomes electrically positive and acidic
ATP synthase
ATPase; converts proton motive force into ATP
What are the 2 components of ATPase
F1 and F0
F1
multi-protein extramembrane complex; faces cytoplasm
F0
proton-conducting intramembrane channel
Citric acid cycle intermediates
common natural plant and fermentation products and can be readily catabolized (citrate, malate, fumarate, succinate)
anaerobic respiration
use of electron acceptors other than oxygen; less energy released compared to aerobic; dependent on electron transport, generation of proton motive force, and ATPase activity
chemolithotrophy
uses inorganic chemicals as electron donors
- typically aerobic
- uses etc and pmf
photophosphorylation
light-mediated ATP synthesis
photoautotrophs
use ATP for assimilation of CO2 for biosynthesis
photoheterotrophs
use ATP for assimilation of organic carbon for biosynthesis
