BIOL 331: Cell Junctions Comprehensive Exam All Questions solved 100% Correct.

How can cells contact each other? - Answer through specialized contacts What interactions do proteins in cellular contacts make? - Answer to other proteins on neighboring cell or substratum and other proteins inside the cell What dictates the function of proteins in cellular contacts? - Answer properties and interactions What kinds of junctions are present in epithelium? - Answer adherents’ junction, gap junction, tight junction, desmosome What is the importance of interactions involving the cell to substratum? - Answer motility (dynamic) What constitutes the Junctional Complex? - Answer Tight junctions (zonula occlude) adherens junctions Desmosomes (macula adherens) Where are tight junctions located? - Answer at the top of the cell What can tight junctions control? - Answer permeability, blood/brain barrier, water-mutation in claudin causes death due to dehydration What can tight junctions control the permeability of? - Answer ions, molecules, proteins, cells How is the blood brain barrier controlled by tight junctions? - Answer ions + water can't pass BUT some cells of the immune system can pass Overall what can tight junctions regulate? - Answer passage of solutes between cells What kind of contact do tight junctions form between cells? - Answer close contacts