BIOL 1090 : Cytoskeleton Comparison Chart

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silverchimpanzee502

27 Apr 2012

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Plus end tends to be near the outside of the cell. Provide intracellular support and spatial organization within the cell. Non-motor: control microtubule organization in the cytosol (tau in neurons) Motor: move along the microtubules and associate with transport vesicles (kinesin and dynein) Provide structural support and mechanical strength to the cell. Contribute to cell mobility and motility by pushing out the leading edge of the cell (lamellipodium) and pulling in the trailing edge. Myosins are the motor proteins associated with microfilaments. Unconventional contribute to cell mobility and motility in non-muscle cells. Branched nucleation occurs at branching points: axonemal: highly organized and stable; part of structures (axonemes) involved in cell movement (flagella, cilia, cytoplasmic: loosely organized, dynamic, located in the cytosol. Heterodimers assemble, maintaining their orientation, to form protofilaments. Minus ends are clustered and anchored by a centrosome in the mtoc. Classes i v: differ depending on cell type. -helical domains wrap around each other to form rope- like dimers.

Related Questions

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

pucebear535

Match each description or phrase with the correct cytoskeletal structure. Note that a cell type can be used more than once or not at all.

cellular contractions

intermediate filaments All cytoskeletal structures microtubule microfilaments None of these

flagellum movement

intermediate filaments All cytoskeletal structures microtubule microfilaments None of these

anchoring one cell to another

intermediate filaments All cytoskeletal structures microtubule microfilaments None of these

maintain cell shape

intermediate filaments All cytoskeletal structures microtubule microfilaments None of these

2. Cytoskeleton components (microfilaments, microtubules and intermediate filaments) are often compared to railroad tracks, which are built by laying down one railroad at a time. Explain why this analogy can describe how the cytoskeleton is built. How does this analogy fall short of illustrating the dynamic instability of cytoskeleton components?

BIOL 1090 : Cytoskeleton Comparison Chart

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