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: 7444

#Unit 5. Developmental Biology

gp 80 – form tight aggregate

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#Id: 1340

#Unit 4. Cell Communication and Cell Signaling

HER1 & HER4, can form stable homodimers after binding a growth factor.

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#Id: 8572

#Unit 2. Cellular Organization

Soft keratins, or cytokeratins, are found in epithelial cells and make up the skin.

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#Id: 5688

#Unit 7. System Physiology – Animal

Oxytocin and vasopressin are typical neural hormones, that is, hormones secreted into the circulation by nerve cells

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#Id: 713

#Unit 3. Fundamental Processes

Physical sequestration of the origin, delay in remethylation, competition for DnaA binding, hydrolysis of DnaA- bound ATP, and repression of dnaA transcription are the key steps to regulate initiation.