Chemical barriers at these surfaces include specialized soluble substances that possess antimicrobial activity as well as acid pH.

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#Id: 3270

#Unit 6. System Physiology – Plant

Complex II as succinate dehydrogenase, the only membrane-bound enzyme in the citric acid cycle

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#Id: 3274

#Unit 6. System Physiology – Plant

Complex II contains five prosthetic groups and four different protein subunits;
a. Subunits A and B extend into the matrix; they contain three 2Fe-2S centers, bound FAD, and a
binding site for the substrate, succinate
b. Subunits C and D are integral membrane proteins, contain a heme group, heme b, and a binding
site for ubiquinone,

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#Id: 3275

#Unit 6. System Physiology – Plant

Complex III, also called cytochrome bc1 complex or ubiquinone;

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#Id: 3276

#Unit 6. System Physiology – Plant

cytochrome C oxidoreductase, couples the transfer of electrons from ubiquinol (QH2) to cytochrome c with the vectorial transport of protons from the matrix to the intermembrane space.

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#Id: 3278

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 3287

#Unit 6. System Physiology – Plant

the Q cycle, has been proposed for the passage of electrons and protons through the complex. The net equation for the redox reactions of the Q cycle is