Microbiology Lecture 27 Flashcards

  1. ETS
    • The electron transport system generates a
    • “proton motive force” that drives protons across
    • the membrane.
    • - The PMF stores energy to make ATP.
  2. Organotrophy (or chemoorganotrophy):
    Lithotrophy (or chemolithotrophy):
    Phototrophy:
    • 1. Organotrophy (or chemoorganotrophy):
    • involves organic electron donors and inorganic
    • or organic terminal electron acceptors
    • 2. Lithotrophy (or chemolithotrophy): involves
    • inorganic electron donors and inorganic or
    • organic terminal acceptors
    • 3. Phototrophy: involves light capture by
    • chlorophyll, usually coupled to splitting of H2S
    • or H2O or organic molecules
  3. oxidoreductases.
    • electron transport proteins
    • - They oxidize one substrate (removing electrons)
    • and reduce another (donating electrons).
  4. Energy Storage
    •  In redox reactions, the ∆G values are proportional to
    • the reduction potential (E) between the oxidized
    • form (e– acceptor) and its reduced form (e– donor).
    • - The reduction potential is a measure of the
    • tendency of a molecule to accept electrons.
    •  A reaction is favored by positive values of E, which
    • yield negative values of ∆G.
    •  The standard reduction potential assumes all
    • reactants and products equal 1 M at pH 7.
  5. proton potential ∆p
    ∆p = ∆ψ – 60∆pH

    • - The electrical potential (∆ψ) arises from the
    • separation of charge between the cytoplasm and
    • solution outside the cell membrane.
    • - The pH difference (∆pH) is the log ratio of
    • external to internal chemical concentration of H+.
  6. Respiratory ETS
    •  Includes at least three functional components:
    • 1. An initial substrate oxidoreductase
    • 2. A mobile electron carrier
    • 3. A terminal oxidase
Author
francis6
ID
319039
Card Set
Microbiology Lecture 27 Flashcards
Description
Lecture 27 flashcards exam 3
Updated