WORLD OF CELL+MASTERING ACCESS >CUSTOM
9th Edition
ISBN: 9781323445044
Author: Hardin
Publisher: PEARSON C
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Chapter 13, Problem 13.4CC
In which of the following cells would you expect to find extensive intermediate filament networks? For each cell type, explain your answer, based on the “lifestyle” of each cell type. Cell types: human epidermis (skin); plant leaf epidermis; snake intestinal smooth muscle cell; sea urchin sperm cell.
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Students have asked these similar questions
There are three major classes of filaments that make up the cytoskeleton. What are they, and what are the differences in their functions? Which cytoskeletal filaments would be most plentiful in a muscle cell or in an epidermal cell making up the outer layer of the skin? explain your answers.
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
There are no known motor proteins that move along intermediate filaments, in contrast to the variety of such proteins that associate with microtubules and actin filaments. What characteristic of intermediate filaments, in their polymerized form, might explain the absence of associated motor proteins? Briefly explain your reasoning.
Chapter 13 Solutions
WORLD OF CELL+MASTERING ACCESS >CUSTOM
Ch. 13 - Cytoskeletal polymers are modular, and their...Ch. 13 - How could you use paclitaxel, which makes MTs less...Ch. 13 - The amount of dynamic instability exhibited by...Ch. 13 - Prob. 13.3CCCh. 13 - In which of the following cells would you expect...Ch. 13 - Filaments and Tubules. Indicate whether each of...Ch. 13 - True or False. Identify each of the following...Ch. 13 - Prob. 13.3PSCh. 13 - Stabilization and the Critical Concentration....Ch. 13 - Prob. 13.5PS
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- What is not a similarity between motility of cilia/flagella and skeletal muscle? Group of answer choices: Both have cytoskeletal fibers arranged in a ring pattern Both involve motor proteins connected to a cytoskeleton "track" Both can produce movement Both require ATP hydrolysisarrow_forwardWhich of the following describes an F-actin microfilament? A flexible, helical filament composed of two strands assembled from G-actin 13 protofilaments composed of heterodimers with a hollow core a flexible filament composed of 13 interwoven protofilaments Eight tetramers twisted into a rope-like filamentarrow_forwardIf you were to watch muscle tissue contract: Under a light microscope, would you see the muscle fibers get narrower, or the striations get thinner? Explain. At the EM level, focusing on one sarcomere, you would be able to see a region of thick filaments overlapping two regions of thin filaments. Use the structure of the thick filaments to explain how ONE region of thick filaments is able to pull in microfilament in two opposite directions (both toward the center of the sarcomere).arrow_forward
- If the graph represents one actin filament, and line A represents dynamic activity at the plus end and line B represents dynamic activity at the minus end, which of the following must be true? Group of answer choices Formin proteins have been removed. Treadmilling is occurring at 1000 mM. CapZ proteins are not present. Nucleation is occurring at 100 mM.arrow_forwardWhich of the following is NOT an intermediate filament? A. keratin B. titan C. nuclear lamin D. vimentinarrow_forwardExplain how the thin and thick filaments interact in the sliding filament model.arrow_forward
- Thin and thick filament are organized into functional unit calledarrow_forwardExplain how the structure of intermediate filaments makes them better suited to provide mechanical strength than either microtubules or actin filaments.?arrow_forwardWhat would be the consequence for actin filament assembly/disassembly if a mutation prevented actin’s ability to bind ATP? What would be the consequence if a mutation prevented actin’s ability to hydrolyze ATP?arrow_forward
- Discuss the following statement: “if plant cells contained intermediate filaments to provide the cells with tensile strength, their cell walls would be dispensable.”arrow_forwardActin and microtubules have polarity, intermediate filaments have no polarity. What is the main consequence of this difference?arrow_forwardWhat is NOT a type of intermediate filament? keratin nuclear lamin dynein neurofilament vimentinarrow_forward
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