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L8 The Cytoskeleton, ECM, and Cellular Junctions (Cell Shape Regulation)

Description

Objectives: Identify the major components of the cytoskeleton Explain how these structures regulate cell shape Describe the composition and origin of the ECM Outline the importance of cell junctions
Mer Scott
Quiz by Mer Scott, updated more than 1 year ago
Mer Scott
Created by Mer Scott about 7 years ago
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Resource summary

Question 1

Question
Which statement about the cytoskeleton is INCORRECT?
Answer
  • The cytoskeleton is a static structure.
  • The cytoskeleton helps maintain cell shape.
  • The cytoskeleton maintains organelles position.
  • The cytoskeleton is important for the movement of vesicles.

Question 2

Question
The cytoskeleton is highly [blank_start]dynamic[blank_end], but still provides [blank_start]stability[blank_end].
Answer
  • dynamic
  • reactive
  • stability
  • some structure

Question 3

Question
There are four components of the cytoskeleton: microtubules, microfilaments, intermediate filaments, and terminal ends.
Answer
  • True
  • False

Question 4

Question
Choose the INCORRECT statement about the cytoskeleton's components.
Answer
  • Microtubules are the smallest filaments in the cytoskeleton.
  • Microfilaments are made up of a double chain of actin.
  • Microfilaments resist tension and are distributed in the outer cytoplasm (cortex).
  • Intermediate filaments are usually made of keratin, which is supercoiled into cables.
  • Intermediate filaments build the nuclear lamina, and anchor organelles.

Question 5

Question
Microtubules resist [blank_start]compression[blank_end], while microfilaments resist [blank_start]tension[blank_end].
Answer
  • compression
  • tension

Question 6

Question
Choose the CORRECT statements about microtubules.
Answer
  • Microtubules can make up flagella and cilia, allowing whole cell movements or movement of external fluid.
  • Microtubules often originate from the peroxisome.
  • Motor proteins travel along microtubules.
  • Microtubules are composed of α-tubulin and β-tubulin.
  • Microtubules are the most stable of the filaments.

Question 7

Question
Microfilaments are the only filaments in the cytoskeleton that form 3D networks with proteins.
Answer
  • True
  • False

Question 8

Question
Choose the statement about cell junctions which is CORRECT.
Answer
  • Tight junctions form a continuous seal which prevents fluid loss.
  • Desmosomes provide pores between cells to transport ions and communicate via (a cytoplasmic connection.)
  • Gap junctions anchor adjacent cells, acting like a rivet.
  • Muscle cells have few desmosomes.

Question 9

Question
Which statement about collagen in the ECM is NOT correct?
Answer
  • Collagen makes up about 50% of total body protein.
  • Collagen resists compression.
  • Collagen is 'turned over', or, recycled.
  • Collagen is a glycoprotein secreted by fibroblasts.

Question 10

Question
The base of the ECM is proteoglycan—an extensively sugared protein.
Answer
  • True
  • False

Question 11

Question
Proteoglycan in the ECM resists tension and traps water.
Answer
  • True
  • False
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