Which of the following statements regarding microtubules is FALSE? Microtubules are typically arranged in cells such that thoir plus (+) ends are directed towards the plasma membrane and their minus (-) ends are attached to the centrosomes. Microtubules are composed of 13 protofilaments that are arranged into a hollow cylinder. Microtubules are polar. Microtubule-binding proteins, such as Tau, bind to microtubules to destabilizo thom. Microtubules are inherently unstable and rapidly disassemble with low/ GTIP concentrations.

Which of the following statements regarding microtubules is FALSE? Microtubules are typically arranged in cells such that thoir plus (+) ends are directed towards the plasma membrane and their minus (-) ends are attached to the centrosomes. Microtubules are composed of 13 protofilaments that are arranged into a hollow cylinder. Microtubules are polar. Microtubule-binding proteins, such as Tau, bind to microtubules to destabilizo thom. Microtubules are inherently unstable and rapidly disassemble with low/ GTIP concentrations.

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter3: Cell Structure

Section: Chapter Questions

Problem 2CT

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In the fluid mosaic model: plasma membrane proteins orient their hydrophilic sides toward the internal bilayer. phospholipids often flip-flop between the inner and outer layers. the mosaic refers to proteins attached to the underlying cytoskeleton. the fluid refers to the phospholipid bilayer. the mosaic refers to the symmetry of the internal membrane proteins and sterols.
Which of the following changes to the microtubule binding protein, Tau, commonly occurs in Alzheimerâ s and other neurodegenerative diseases? A Tau is hypo-phosphorylated and does not bind to microtubules to destabilize them. B Tau levels are so low in the cell that they only bind to some microtubules. C Tau is hyper-phosphorylated and does not bind to microtubules to stabilize them. D Microtubules are hyper-phosphorylated and do not bind to Tau.
Briefly describe the structure and function of each of the following: plasma membrane, chromatin, nucleus, nucleolus, rough endoplasmic reticulum (rough ER), Golgi complex, lysosomes, mitochondria, microfilaments, microtubules, intermediate filaments, centrioles, basal body (kinetosome), tight junction, gap junction, desmosome, glycoprotein, microvilli.
Vesicles forming at the plasma membrane, or at the trans face of the Golgi, and destined only to fuse with endosomes and lysosomes, are generally not associated with which of the following proteins? dynamin proteins cargo receptor proteins clathrin proteins collagen proteins adaptin proteins
Which of the following is not a cellular activity associated with microtubules? maintenance of axons mititotic spindle cilial structure cell shape orientation of cellulose microfibrils All of the following are roles of microfilaments except cell migration. muscle cell contraction. mitotic spindle formation. cytoplasmic streaming. amoeboid movement.
Which of the following statements regarding cytoskeletal filaments is FALSE? Microtubules will rapidly disassemble in response to a drop in the ATP concentration. G-actin monomers and alpha-tubulin/beta-tubulin dimers assemble into filaments in their ATP-bound and GTP-bound forms, respectively. Microtubules are stabilized by microtubule-binding proteins, such as Tau. Actin-binding proteins allow F-actin to assemble in cells in many different ways. Hydrolysis of ATP and GTP changes the conformation of the subunits once they are incorporated into actin filaments and microtubules, respectively.
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