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BIO 353 Exam 4 Study Guide Lecture 20 Questions and Answers 100% Pass define cytoskeleton - a network of filaments or tubes composed of protein subunits and associated proteins what are the three structural elements that constitute the cytoskeleton - intermediate filaments, microtubules, and a...

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  • January 23, 2025
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  • Bio 353
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KatelynWhitman
BIO 353 Exam 4 Study Guide Lecture
20 Questions and Answers 100% Pass


define cytoskeleton - ✔✔a network of filaments or tubes composed of protein subunits

and associated proteins


what are the three structural elements that constitute the cytoskeleton - ✔✔intermediate

filaments, microtubules, and actin filaments


what are the primary functions of the cytoskeleton - ✔✔cell motility, intracellular

motility, cytoplasmic order, and cell and tissue shape and support


what are the characteristics of intermediate filaments - ✔✔tough ropelike fibers, do not

bind nucleotides, form structurally non-polar filaments, provides mechanical support to

cells and tissues


what is the subunit of intermediate filaments - ✔✔intermediate filament protein


are intermediate filaments structurally polar - ✔✔no they are non-polar


do intermediate filaments have associated motor proteins - ✔✔no, they are not directly

responsible for generating intra-cellular movements




Katelyn Whitman, All Rights Reserved © 2025 1

, what is the primary function of intermediate filaments - ✔✔impart strength providing

mechanical support to cells and tissues


what are some examples of cytoskeletal structures that consist of intermediate filaments

- ✔✔keratin filaments, neurofilaments, and nuclear lamins


what is keratin - ✔✔epithelial cellular and tissue support


what is plectin - ✔✔intermediate filament accessory protein


what does plectin do - ✔✔further stabilizes and reinforces network by cross-linking

intermediate filaments into bundles and links them to microtubules, actin filaments,

and adhesive structures in desmosomes


what is epidermolysis bullosa simplex - ✔✔a rare mutation in keratin gene produces

defective filament assembly resulting in weakened keratin network; cell layer is highly

susceptible to mechanical trauma from rubbing of the skin during movement causing

non-scarring blisters disease; no cure


what are lamins - ✔✔intermediate filaments found in nuclei of all eukaryotic cells


what is the nuclear lamina - ✔✔interconnected web of filaments that underlies the inner

nuclear membrane




Katelyn Whitman, All Rights Reserved © 2025 2

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