Which of the following is not true of dynamic instability of microtubules inside

Question

Which of the following is not true of dynamic instability of microtubules inside cells? A) Microtubules grow and shrink at the plus end B) Addition of GTP bound tubulin dimer forms a GTP cap C) Tubulin dimers undergo tread milling D) GTP hydrolysis results in depolymerization of microtubules The extension of a lamellipoduim by a migrating cell does not depend on the following A) Assembly of actin monomers at the plus end of actin filaments B) Formation of branched actin filaments by ArP2/3 C) Formation of GTP cap D) Disassembly of actin monomers at the minus end of the actin filaments Which of the following statements about intermediate filaments is false? A) Keratin is a type of nuclear intermediate filament B) Plectin links intermediate filaments to microtubules C) Intermediate filaments consist of 8 tetramer strands D) Vimentin in muscle cells distributes local forces Microtubules growth is dependent on which of the following proteins or structures? A) Arp2/

Explanation / Answer

9.(D) GTP hydrolysis results in depolymerization of microtubules
10.(C) Formation of GTP cap
11.(C) Intermediate filaments consist of 8 tetramer strands
12.(B) gamma tubulin complex
13.(A) Laminin
14.(B) muscle relaxation results in the shortening of the sarcomere
15.(D) GTP hydrolysis
16.(C) Cartilage is a type of connective tissue
17.(A) The collagen proteases cleave the termini of procollagen

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