Which of the following domains is shared by all myosins? ATP-binding domain GTP-

Question

Which of the following domains is shared by all myosins? ATP-binding domain GTP-binding domain Tubulin binding domain Homo-oligomerization domain A central coiled coil domain How does the (-) end F-actin binding protein tropomodulin contribute to muscle contraction? It stabilizing the F-actin (-) end It blocks depolymerization at the (+) end O It blocks myosin binding It blocks ATP hydrolysis It blocks myosin movement towards the (+) end 3. Which of the following statements best describes the function of cofilin, a protein that destabilizes the (-) end of F-actin, during cell migration? It sequesters G-actin ATP It induces actin polymerization It promotes attachment of the leading edge to the substratum It induces the formation of a branched actin network at the leading edge Within the lamellipodium, it promotes actin network disassembly, freeing up G-actin subunit for assembly of a new action network 4. What is the effect of expressing a constitutively active form of the small GTPase Rac1 ? Cells depolymerize actin Cells form lamellipodial extensions Cells form stress fibers Cells form filopodia Cells form focal adhesions

Explanation / Answer

Which of the following domains shared by all myosins

ATP binding domain-answer

All myosins share a generic motor domain that harbors the binding sites for ATP.

How does the (-) end F-actin binding protein tropomodulin contribute to muscle contraction

It stabilizing the Faction (-) end ---answer

It binds at the (-) end and stabilizes the filament.

Which of the following statement best describes the function of cofiln a protein that destabilises the (-) end of F-actin during cell migration

It induced action polymerisation-answer

What is the effect of expressing a constitutively active form of the small GTPASE Rac 1

Cell form lamellopodial extensions--answer

Rac1 : It is a little (~21 kDa) flagging G protein (all the more particularly a GTPase), and is an individual from the Rac subfamily of the family Rho group of GTPases. Individuals from this superfamily seem to direct a various exhibit of cell occasions, including the control of GLUT4[6] translocation to glucose take-up, cell development, cytoskeletal revamping, antimicrobial cytotoxicity, and the initiation of protein kinases.Rac1 is a pleiotropic controller of numerous cell forms, including the cell cycle, cell-cell bond, motility (through the actin arrange), and of epithelial separation (proposed to be vital for keeping up epidermal undifferentiated organisms).

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By controlling actin polymerization and depolymerization, the cell can make compels that create a few sorts of development. A great case is the development of a finger of film from the phone surface amid the acrosome response of an echinoderm sperm cell .. Later illustrations recommend that actin polymerization fortified by profilin is a typical instrument for producing the drive for development of intracellular pathogens and for cell velocity.

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