Which of following structures contains tight bundles of actin? A) Membrane ruffl

Question

Which of following structures contains tight bundles of actin? A) Membrane ruffles B) Lamellipodia C) Pseudopodia D) Filopodia Microtubules are known to grow out from an organizing center. Which of the following is not a microtubules organizing center? A) Centrosome B) Poles of the mitotic spindle C) Desmosome D) Basal body in a ciliated cell 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 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 The extension of a lamellipoduim by a mig

Explanation / Answer

5. d) Filopodia in nerve growth cones contain tightly packed bundles of actin filaments that usually contain more than 15 parallel filaments.

6. desmosome

7. A) Microtubulin grow and shrink at the plus end.

8. A) keratin is a type of nuclear intermediate filament.

9.

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