Respiration and Lithotrophy
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What is the electron donor and acceptor? Proton gradient formation? aerobic organotrophy
e- donor: organic compound e- acceptor: oxygen yes
What is the electron donor and acceptor? Proton gradient formation? anaerobic organotrophy
e- donor: organic compund e- acceptor: inorganic compund (varies) no fermentation
What is the electron donor and acceptor? Proton gradient formation? Iron Oxidation lithotrophy
e- donor: Fe 2+ e- acceptor: oxygen yes (already set) Iron stays outside the cell, lots of H+ in the environment
What is the electron donor and acceptor? Proton gradient formation? aerobic nitrogen oxidation/nitrification lithotrophy
e- donor: N species e- acceptor: oxygen yes
What is the electron donor and acceptor? Proton gradient formation? anaerobic nitrogen oxidation/annamox lithotrophy happens in the annamoxosome
e- donor: NH4+ e- acceptor: NO2- (nitrite) yes very toxic hydrazine held inside annamoxosome by ladderane lipids happens in planctomycetes
What is the electron donor and acceptor? Proton gradient formation? sulfur and metal oxidation lithotrophy
e- donor: H2S e- acceptor: oxygen yes creates acidic environment, can cause corrosion
What is the electron donor and acceptor? Proton gradient formation? Hydrogenotrophy lithotrophy
e- donor: H2 e- acceptor: varies yes
What is the electron donor and acceptor? Proton gradient formation? methanogenesis lithotrophy
e- donor: H2 e- acceptor: CO2 (or 1 or 2 C cmpds) yes CH4 produced, only archaea can do it
How many ATP are produced from 1 molecule of glucose in aerobic respiration? (ideally, not actual yield)
38
How many ATP are produced from 1 molecule of glucose in anaerobic fermentation?
2
As part of a TCA cycle modification… What is glyoxylate bypass? How does the cell benefit from it?
allows the catabolism of lipids in low oxygen and glucose conditions keeps carbons for biomass seen in acid fast and pseudomonas (G -ve)
What is syntrophy?
when an organism couples its metabolism to drive reactions with an overall - delta G (spontaneous)
What is reduction potential? What is the symbol for it? What does a negative or positive value mean?
potential in energy being made if a compound is an e- acceptor or donor Eº more negative = better donor, more positive = better acceptor
What is an oxidoreductase? What does it do with electrons?
the final enzyme in the final protein of the ETS facilitates e- transfer