BMS 300 Exam 1 corrections (Verified)

Integrins are transmembrane proteins that can bind to molecules called catenins which are cytoplasmic proteins and to laminins, which are extracellular protein. You would expect to find these transmembrane proteins in: a. desmosomes in epithelial cells b. hemidesmosomes in epithelial cells c. communicating junctions in connective tissue d. occluding junctions in epithelia e. a and b are correct correct answers b. hemidesmosomes in epithelial cells A consensus sequence of bases that commonly includes TATA is: a. at the 3' end of a gene b. where DNA polymerase binds to initiate replication c. where helicase binds to begin untwisting the DNA helix d. where transcription factors bind to DNA to initiate gene transcription e. a and d are correct correct answers e. a and d are correct Connexons are clustered at gap junctions where they provide cytoplasmic continuity between adjacent cells. Each connexon contains six connexins; each connexin crosses the membrane four times. You would expect each of the transmembrane segments of the protein to be composed entirely of: a. amphipathic phosphate head groups b. alpha helices c. beta-sheets d. phospholipids e. hydrophilic R groups correct answers b. alpha helices Kinesin, dynein, and myosin are all: a. plus end directed motors b. tubulin binding proteins c. actin binding proteins d. ATPases e. a and d are correct correct answers d. ATPases Epithelial tissue is composed mostly of: a. fibrocytes b. extracellular proteins that have been secreted by widely dispersed cells. c. chondrocytes d. cells oriented on a basal lamina e. all except a are correct correct answers d. cells oriented on a basal lamina