BIOL 1010U Study Guide - Adherens Junction, Desmosome, Membrane Protein

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jadeworm132

24 Nov 2014

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Encircles cell, like adherens junctions: composition integral membrane proteins. Extracellular matrix: although the cytoskeleton and cellular junctions are important in maintaining cell/tissue structure, the extracellular matrix (ecm) provides the framework. Ecm is an insoluble meshwork made up of proteins and polysaccharides, secreted/modified by many different types of cells. Differ in amount, type and organization of proteins and polysaccharides that make them up. E. g. connective tissue has large amounts of ecm; bone ecm contains minerals and collagen. Extracellular matrix in plants: composition, middle lamina. In plants, ecm is the cell wall (cellulose) Provides support by forming interconnected network between cells. Ecm of animal cells is secreted by cells in a mixture of proteins and polysaccharides: composition: large fibrous proteins (including collagen, elastin, Half desmosomse : attaches epithelial cells to basal lamina, cell adhesion molecule = integrin. Ecm proteins in basal lamina: cytoplasmic domain binds to intermediate filaments of.

Related Questions

Match the following choices to the statements.

1) Formed by proteins that create tunnels between cells

a) Adhesion Belts

b) none are correct

c) desmosomes

d) gap junctions

e) tight junctions

2) A site of linkage between the extracellular matrix and the cytoskeleton

a) Adhesion Belts

b) none are correct

c) desmosomes

d) gap junctions

e) tight junctions

3) A site of linkage between the actin cytoskeleton of two adjacent cells

a) Adhesion Belts

b) none are correct

c) desmosomes

d) gap junctions

e) tight junctions

4) Rely on intermediate filaments to connect cells to an adjacent cell

a) Adhesion Belts

b) none are correct

c) desmosomes

d) gap junctions

e) tight junctions

5) Are non-functional in patients with a genetic disorder known as Pemphigus vulgaris

a) Adhesion Belts

b) none are correct

c) desmosomes

d) gap junctions

e) tight junctions

6) Are abundant in tissues that experience high mechanical stress (e.g., heart muscle)

a) Adhesion Belts

b) none are correct

c) desmosomes

d) gap junctions

e) tight junctions

1. How does the extracellular matrix affect a cell that it surrounds? (Select all that apply.)

		The cell's shape depends in part on the structure and composition of the extracellular matrix.
		The genes that the cell expresses depend in part on the types of proteins in the extracellular matrix.
		The size that the cell grows to depends in part on the polysaccharides in the extracellular matrix.
		The extracellular matrix has no effect on the cells that it surrounds.
		All of these choices are correct.

2. Dynamic instability is the rapid assembly and disassembly of:

		microfilaments.
		intermediate filaments.
		microtubules.

3. Which one of the following is a characteristic shared by integrins and cadherins?

		Both are peripheral membrane proteins.

		Both are present in adherens junctions, desmosomes, and hemidesmosomes.
		The cytoplasmic domains of both proteins are connected to the cytoskeleton.

4. Which of the following is a mesh-like attachment between cells formed by binding of transmembrane proteins of one cell to the same protein type on the adjacent cell, preventing substances from passing between cells?

		a.) adherens junction
		b.)desmosome

		c.) tight junction

viridianlion889

1. How does the extracellular matrix affect a cell that it surrounds? (Select all that apply.)

	The cell's shape depends in part on the structure and composition of the extracellular matrix.
	The genes that the cell expresses depend in part on the types of proteins in the extracellular matrix.
	The size that the cell grows to depends in part on the polysaccharides in the extracellular matrix.
	The extracellular matrix has no effect on the cells that it surrounds.
	All of these choices are correct.

2. Which of the following enable(s) the movement of cells?

	microtubules
	microfilaments
	intermediate filaments
	microtubules and microfilaments
	microfilaments and intermediate filaments

3. Microtubules increase in length:

	more quickly at one end than the other.
	by growing outward from the centrosome.
	in cycles, following rapid depolymerization.
	if free tubulin dimers are available.
	All of these choices are correct.

4. Dynamic instability is the rapid assembly and disassembly of:

	microfilaments.
	intermediate filaments.
	microtubules.
	both microfilaments and microtubules.

5. Which one of the following is a characteristic shared by integrins and cadherins?

	Both are peripheral membrane proteins.
	Both facilitate the adhesion of cells to extracellular matrix proteins.
	Both are present in adherens junctions, desmosomes, and hemidesmosomes.
	The cytoplasmic domains of both proteins are connected to the cytoskeleton.

6. Cadherin is an example of a(n):

	motor protein.
	intermediate filament protein.
	cell adhesion molecule.
	extracellular matrix protein.

7. Which is the CORRECT order from lesser to greater complexity for the following?

	organs, tissues, cells
	cells, tissues, organs
	tissues, organs, cells
	cells, organs, tissues

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BIOL 1010U Study Guide - Adherens Junction, Desmosome, Membrane Protein

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