Molecular Cell Biology

Biology

Quiz 16 :
Cell Organization and Movement I: Microfilaments

Quiz 16 :
Cell Organization and Movement I: Microfilaments

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The plasma membrane of eukaryotic cells is supported by:
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Answer:

A

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Three major groups of filament systems comprising the cytoskeleton are all composed of polymers of assembled subunits,which vary in thickness when assembled.Which is the correct order,from smallest to largest,of the filament systems?
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Answer:

D

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Actin-binding proteins that generate actin filament bundles:
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Answer:

D

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Decoration of actin filaments with myosin S1 is commonly used to:
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Many actin cross-linking proteins contain:
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Within an actin filament,each actin subunit is surrounded by _____ neighboring actin subunits.
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How do actin filaments appear when viewed by negative stain electron microscopy?
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What cellular components cause some actin filaments to form bundles and others to form networks?
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At ATP-G-actin concentrations that are intermediate between the Cc for the (+)end and the Cc for the (-)end,_____ will be observed.The Cc needed for elongation at the (+)end is _____ than that at the (-)end of actin microfilaments.
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All of the following statements about actin assembly are correct EXCEPT:
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Gelsolin is activated by:
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During treadmilling,actin subunits add:
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Which of the following proteins promotes actin assembly and is involved in signaling pathways controlling actin assembly at the plasma membrane?
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Listeria is a bacterial parasite that has evolved unique ways to enter animal cells and then use actin polymerization for its intracellular movement.Which of the following statements is true in regards to Listeria and actin polymerization?
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What actin-binding protein mediates gel-sol transitions,and how is this protein's activity regulated?
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What is the function of thymosin β₄?
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A well-coordinated mechanism involving cell-surface receptors and the actin cytoskeleton allows leukocytes to bind and engulf invading bacteria.Briefly describe how bacteria are phagocytosed.
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Which of the following is a G-actin sequestering protein that allows cells to maintain a relatively high G-actin concentration in cells?
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Cofilin:
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If the activity of thymosin β4 was inhibited in fibroblasts,the overall effect would be:
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