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.

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.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter5: Membranes And Transport

Section: Chapter Questions

Problem 1TYK: In the fluid mosaic model: plasma membrane proteins orient their hydrophilic sides toward the...

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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 applies to all three major classes of cytoskeletal polymers (microtubules, actin filaments and intermediate filaments)? They have intrinsic polarity They assemble from protein subunits synthesized on free polyribosomes They add subunits only at their ends They are involved in cell motility Their constituent proteins are tissue specific
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.
Match the type of cytoskeleton protein to the structure, protein, or role by writing the correct letter in the blank. Microtubules Microfilaments Intermediate filaments _________ Position organelles _________ Are not dynamic _________ Profilin _________ Form the contractile ring _________ Composed of tubulin _________ Stabilized by Tau proteins _________ Associate with myosin motors _________ Have dynamic instability _________ Pull sister chromatid apart during mitosis _________ Arp2/3 _________ Associated with kinesin and dynein motors _________ Formed by most abundant cellular protein _________ Treadmilling
Which of the following is a correct match between a cytoskeletal element and its function? Select one: A. microtubules and chromosome movement B. microfilaments and flagellar motility C. microtubules and cleavage furrow formation D. intermediate filaments and cytoplasmic streaming E. microfilaments and intracellular vesicle transport
Match each of the following to its role in the cell. Microtubules Actin Tubulin Intermediate filaments Kinesin Dynein Myosin Centrosome A. Cytoskeletal fiber that is intermediate in diameter and very sturdy. Does not form from polymerization of protein monomers like the other ones we discussed in class, but consists of polypeptide strands. Keratin and Lamin A are examples. B. The structure that initiates polymerization of new microtubules and anchors microtubules in the center of the cell near the Golgi Complex. C. Motor protein whose activity results in contraction of muscle. D. Thinnest cytoskeletal filament. Responsible for initiation of amoeboid cell movement via pseudopod formation. E. The "monomer" unit of the thickest cytoskeletal polymer; a dimer of two polypeptide subunits. F. Cytoskeletal structure with the…
Microtubules, composed of a-tubulin and b-tubulin subunits, are required for all of the following eukaryotic cell movements except: axonal transport of vesicles in neurons movement of eukaryotic cilia movement of chromosomes during mitosis movement of eukaryotic flagella extension of a pseudopod during phagocytosis
In addition to providing support, the cytoskeleton immobilizes enzymes and moves organelles to suitable positions in the cytoplasm. What advantage do these circumstances have over allowing the cell contents to freely diffuse in the cytoplasm?
There are three components of the cytoskeleton that vary in size. The correct order of these components in order of smallest to largest is . Group of answer choices Microtubules, Intermediate Filaments, Microfilaments Microfilaments, Intermediate Filaments, Microtubules Microfilaments, Microtubules, Intermediate Filaments None of the Above
Which of the following is NOT a component of the cytoskeleton? Microtubules intermediate filaments Microfilaments Primary filaments
In addition to providing support, the cytoskeleton immobilizes enzymes and organelles in the cytoplasm. What advantage does this immobilization have over allowing the cellcontents to freely diffuse in the cytoplasm?
List their functions Cytoplasm, nucleoplasm/karyoplasm Ribosomes: protein factories of the cell Centrosomes and centrioles: helpers in cell division Cytoskeleton: microfilaments, microtubules, intermediate filaments

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		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.