19. Which of the following statements about actin is true? A. Binding of actin filaments by ARPS promotes disassembly of actin filaments. B. Actin treadmilling occurs at high concentrations of actin. C. Focal adhesions are released at the beginning of cell movement and do not reform until the cell has reached its destination. D. Actin polymerization initiates protrusion of the membrane in lamellipodia and filopodia.

19. Which of the following statements about actin is true? A. Binding of actin filaments by ARPS promotes disassembly of actin filaments. B. Actin treadmilling occurs at high concentrations of actin. C. Focal adhesions are released at the beginning of cell movement and do not reform until the cell has reached its destination. D. Actin polymerization initiates protrusion of the membrane in lamellipodia and filopodia.

Medical Terminology for Health Professions, Spiral bound Version (MindTap Course List)

8th Edition

ISBN:9781305634350

Author:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. Schroeder

Publisher:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. Schroeder

ChapterCom: Comprehensive Medical Terminology Review

Section: Chapter Questions

Problem 88RS

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The following is FALSE about actin polymerization: a. F-actin with ADP bound is removed from the end of an actin filament b. G-actin with ATP bound is removed from the end of a depolymerizing actin filament - c. None of the answers d. F-actin with ADP bound is required for depolymerization of an actin filament e. G-actin with ATP bound is added to the + end or growing end of an actin filament
1. Name the two types of structures that mediate cell-cell contact and are associated with intermediate filaments. 2. The dynamic behavior of microtubules is regulated by a variety of MAPs. What does this stand for? 3. Name the two motor proteins responsible for powering the variety of movements
What sort of cellular changes would you expect a sailor sick with scurvy to experience? O Their collagen (an extracellular matrix component) would be diminished, resulting in fewer binding sites for integrins. The end result would be less adherent cells. O Their collagen (a cytoskeletal fiber) would be diminished, resulting in a loss of contractile motion within the cell, affecting both cell migration and muscle function.
Match the cellular junction with its characteristic (side of cell, cellular role, intracellular connection or transmembrane protein) tight junctions focal adhesions desomsomes gap junctions A. link the intermediate filaments of neighboring cells using homophilic cadherin-cadherin binding B. integrins link the actin-myosin stress fibers to the extracellular matrix C. occludins bind to occludins and prohibit the diffusion of membrane proteins from the baso-lateral surface to the apical surface of epithelial cells D. connexons form pores between cells in an epithelial sheet or tube
Which of the following statements are true for both actin and tubulin: a. Both actin and tubulin filaments are hollow. b. Both actin and tubulin are structural proteins capable to form filaments that can grow from both (+) and (-) ends. c. Both actin and tubulin require GTP for polymerization into filaments. d. Both actin and tubulin require ATP for polymerization into filaments.
Below are three statements - two of which are truths and one is a lie. Which of the following statements is a lie? Select one: a. Keratin - an intermediate filament, is classified as Types I and II or acid and base keratins. b. Microfilaments have two structures called bundles and networks. The former is used for movement inside the cell while the latter is for intercellular communication. c. Kinesin is a microtubule motor protein that helps in the transportation of cellular material essential to cell function and moves towards the minus end motor. Clear my choice
The tigroid lysis is observed in a case of functional exhaustion of the neuron. It is resulted in decay of basophilic substance and brightening of the neuroplasma. What organelles changes do this phenomenon is associated with? a. Granular endoplasmic reticulum O b. Lysosomes O c. Neurofibrils d. Golgi apparatus O e. Mitochondria
Which of the following are differences between the assembly processes of intermediate filaments versus that of actin microfilaments? A. New subunits are added internally to the intermediate filament rather than at the ends B. Assembly requires GTP rather than ATP C. Intermediate filaments are assembled from multiple tetramers rather than from monomers. D. A and B E. A and C
A melanosome (type of vesicle containing the pigment melanin) is transported towards the nucleus of the cell. The hydrolysis of ATP is involved with this movement. Identify the most likely motor protein and cytoskeletal filament involved with this transport. a. Myosin, microtubules b. Kinesin, actin filaments c. Dynein, actin filaments d. Dynein, microtubules e. Kinesin, microtubules f. Myosin, actin filaments
Fast block to polyspermy is achieved by a. actin polymerization b. action potential c. osmosis d. membrane depolarization e. exocytosis
1. Which of the following is responsible for the transport of vesicles along microfilaments? a. Myosin V b. Dynein c. Myson II d. Cofilin e. Kinesin 2. Which of the following is NOT an example of a microfilament-based structure? a. Microvilli structure b. Phagocytosis c. Scission of new vesicles d. Contractile ring e. Vesicle transport
1) capZ encourages the elongation of actin filaments (true or false) 2)microtubules are tissue specific (true or false ) 3) microtubule-associated proteins stabilize microtubules along their length (true or false)