39. The hydrolysis of GTP to GDP carried out by tubulin molecules a provides the energy needed for tubulin to polymerizo

[answerhappygod]

39 The Hydrolysis Of Gtp To Gdp Carried Out By Tubulin Molecules A Provides The Energy Needed For Tubulin To Polymerizo 1 (68.25 KiB) Viewed 37 times

39. The hydrolysis of GTP to GDP carried out by tubulin molecules a provides the energy needed for tubulin to polymerizo. b. occurs because the pool of free GDP has run out. c. tips the balance in favor of microtubule assembly. d. allows the behavior of microtubules called dynamic instability. 40. The thick filament used in muscle contraction is composed of what? A. actin filaments B. intermediate filaments C. microtubules D. basal bodies E myosin motor proteins 41. What acts as a nucleator of mictrotubule growth? A. alpha-tubulin B. beta-tubulin C. gamma tubulin D. tubulin-ADP Etropomyosin 42. Microtubules grow and shrink by what general mechanism? A. Dynamic instability B. treadmilling C.Phosphorylation of tubulin at + end D. Phosphorylation of tubulin at minus end 43. Kinesins and dyncins have tails that bind to the filaments. b. move along both microtubules and actin filaments. c. move in opposite directions to each other. d. derive their energy from GTP hydrolysis. 44. For both actin and microtubule polymerization, nucleotide hydrolysis is important for 2 stabilizing the filaments once they are formed. b. increasing the rate at which subunits are added to the filaments. c. promoting nucleation of filaments. d. decreasing the binding strength between subunits on filaments. c. regenerating the pool of active monomers 45. Cell migration is driven by what force? A. actin filament polymerization at lagging edge B. actin filament polymerization in lamellapedia C. microbula growth at leading edge D. microtubule growth in cilia E. intermediate filaments polymerization 46. Depolymerization of actin filaments occurs faster at the minus end, where A. the actin subunits have no nucleotides bound B. the actin subunits have bound ATP C. the actin subunits have bound ADP D. the actin subunits are bound to GDP