Exam 9: The Cytoskeleton and Cell Motility

Which type of cytoskeletal element is characterized as a hollow,rigid cylindrical tube with walls composed of tubulin subunits?

Fluorescence microscopy allows investigators to view things _________ of regular light microscopes.

A culture of Dictyostelium slime mold is prepared in which the myosin II gene is deleted.In which activity or activities below are these cells unable to participate?

If the FRAP technique is used to bleach a small zone of fluorescent microtubules in a cell,which of the following is a possible explanation for the recovery of fluorescence in the region of the cell previously bleached?

The presence of what ion appears to be necessary for connecting the ciliary (axonemal)dynein arms to the A microtubules of the axoneme?

Kinesin movement along a microtubule is said to be ________ meaning that it can move long distances along an individual microtubule without falling off. a)excessive b)processive c)depressive d)progressive e)egressive

In a normal microtubule,how many protofilaments make up its cylindrical wall?

The cross-bridges that hold intermediate filaments together are composed of _______.

Along which structure do membranous vesicles and organelles typically engage in local movement in the cell periphery of an animal cell?

Along which structure do membranous vesicles and organelles typically move long distances in an animal cell?

Which of the following treatments did not help microtubules to polymerize when homogenates prepared from brain tissue received it?

TIRF works by _________________.

Which property below is most characteristic of intermediate filaments?

With which of the following structures are intermediate filaments associated?

What protein is responsible for intraflagellar transport of kinesin-II molecules and recycled axonemal proteins toward the basal body?

The movement of endocytic vesicles formed in the neuron terminals from the synapse to the cell body is said to be in a(n)________ direction.

Which region of the sarcomere contains only actin thin filaments or microfilaments?

Proteins that accelerate the polymerization of actin filaments are called ________.

An element of the cytoskeleton is treated with ferritin-labeled antibodies to dynein and visualized in the electron microscope.Ferritin can be seen attached to these elements.What are they? What physical property of the cytoskeletal element would support your conclusion?

_______ is an elastic protein that connects tubulin doublets in cilia and flagellae.The resultant bridges play an important role in ciliary and flagellar movement by limiting the extent that adjacent doublets can slide over one another.The resistance to sliding provided by these bridges causes the axoneme to bend.