Cells can be described as having a cytoskeleton of

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45) Cells can be described as having a cytoskeleton of internal structures that contribute to the shape, organization, and movement of the cell. Which of the following are part of the cytoskeleton? A) the nuclear envelope B) mitochondria C) microfilaments D) lysosomes E) nucleoli Answer: A Topic: Concept 6.6 Skill: Knowledge/Comprehension 46) Of the following, which cell structure would most likely be visible with a light microscope that has been manufactured to the maximum resolving power possible?
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13 47) Which of the following contain the 9 + 2 arrangement of microtubules? Use the following to answer the following questions. All three are involved in maintenance of cell shape. Property Microtubules (tubulin polymers) Microfilaments (actin filaments) Intermediate filaments Structure Hollow tubes; wall consists of 13 columns of tubulin molecules Two intertwined strands of actin, each a polymer of actin subunits Fibrous proteins supercoiled into thicker cables Diameter 25 nm with 15-nm lumen 7 nm 8-12 nm Main functions Cell motility Cell motility Anchorage 48) Tubulin is a dimer, made up of 2 slightly different polypeptides, alpha and beta. Given the structure above, what is the most likely consequence to the structure of the microtubule? 49) The differences among the three categories of cytoskeletal elements would suggest that each of the following has specialized roles. Which of the following is a correct match? A) microfilaments and the nuclear lamina B) microtubules and cleavage furrow formation C) microfilaments and ciliary motion D) intermediate filaments and cytoplasmic streaming E) microtubules and chromosome movement
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14 Answer: E Topic: Concept 6.6 Skill: Application/Analysis 50) Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. This leads us to which of the following as a probable hypothesis?
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