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- Which of the following is not a cellular activity associated with microtubules? maintenance of axons mititotic spindle cilial structure cell shape orientation of cellulose microfibrils All of the following are roles of microfilaments except cell migration. muscle cell contraction. mitotic spindle formation. cytoplasmic streaming. amoeboid movement.On which of the following intracellular locations does clathrin organize a coat and form vesicles? lysosome trans-Golgi rough ER cis-Golgi100% Normal text Verdana 10 %3D Which of the following would allow for communication between neighboring cells, so that the involved cell's could cdordinate a specific activity? desmosomes and gap junctions desmosomes tight junctions gap junctions étv4 Aa ok Pro
- Which of the following statements applies to all three major classes of cytoskeletal polymers (microtubules, actin filaments and intermediate filaments)? They have intrinsic polarity They assemble from protein subunits synthesized on free polyribosomes They add subunits only at their ends They are involved in cell motility Their constituent proteins are tissue specificWhich of the followings is filament-bundling proteins? Сapz alpha-actinin and fimbrin O thymosin beta4 SpectrinWhich of the following cell junctions are involved with anchoring of the cell to the extracellular matrix? Select all that apply Desmosomes Gap Junctions Hemidesmosomes Adherens junctions
- Which of the following are short lives microtubules? Spindle fibers Cilia Flagella All of the aboveWhich of the following is NOT a component of the cytoskeleton? Microtubules intermediate filaments Microfilaments Primary filamentsWhich of the following statements is TRUE? Polymerization occurs predominantly at the minus (-) ends of microtubules. Polymerization is favored when tubulin is bound to GDP. Microtubules do not undergo polymerization or depolymerization until the cell receives a signal Tubulin is an enzyme.
- Figure 4.2 Which of the following terms best describes the cell in Figure 4.2? axial filament O lophotrichous flagella O monotrichous flagellum O peritrichous flagella O amphitrichous flagellaVesicles forming at the plasma membrane, or at the trans face of the Golgi, and destined only to fuse with endosomes and lysosomes, are generally not associated with which of the following proteins? dynamin proteins cargo receptor proteins clathrin proteins collagen proteins adaptin proteinsWhich of the following statements regarding cytoskeletal filaments is FALSE? Microtubules will rapidly disassemble in response to a drop in the ATP concentration. G-actin monomers and alpha-tubulin/beta-tubulin dimers assemble into filaments in their ATP-bound and GTP-bound forms, respectively. Microtubules are stabilized by microtubule-binding proteins, such as Tau. Actin-binding proteins allow F-actin to assemble in cells in many different ways. Hydrolysis of ATP and GTP changes the conformation of the subunits once they are incorporated into actin filaments and microtubules, respectively.