Exam 9: The Cytoskeleton and Cell Motility

The elongation of the cells of the neural plate occurs when ___________ become oriented with their long axes parallel to that of the cells.

You use an ionic detergent to extract materials from a cell.When you do,much of the mRNA stays behind with the cytoskeleton,which is not solubilized by this treatment.What do these results mean?

Motor proteins are able to generate force by ___________.

What part of the molecular motor kinesin is responsible for binding to the cargo to be hauled?

The myosin filament is characterized as a(n)_________ filament.

The deletion of the mreB gene in Escherichia coli results in __________.

Given that axons growing out of a neuron require the growth outward of microtubules to support the lengthening axon,what would be likely to happen to axons growing out from a neuron when they are exposed to colchicine or nocodazole?

Which element of the cytoskeleton is found in the cytoplasm and the nucleus?

PC1 and PC2 form a complex in which PC2 serves as a(n)____________.

Which of the following molecules is diffusible and serves as an attractant for axons growing within the early embryo?

It was found that Listeria infection could be spread from one cell to its neighbors on a petri dish even in the presence of extracellular antibiotic.This suggested that ___________.

A researcher injected photoactivatable actin monomers into cells that had been infected with Listeria and selected actin tails to study in more detail using fluorescence video microscopy.She photoactivated fluorescent actin in a small region of the tail and observed that the faster-moving bacteria had __________ and demonstrated that the rate of movement and the length of the tail were _______________.

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

What purpose are actin filaments presumed to fulfill in the locomotor protrusions in the peripheral domain of the growth cone?

Which element of the cytoskeleton is found in the cytoplasm and the nucleus?

Using a macrophage‐like cell line,researchers infected one set of petri dishes with wild‐type Listeria ,and,as a negative control,infected another set with a Listeria mutant that was unable to enter cells.At specific time points,the cells were fixed and prepared for electron microscopy.Two hours after infection,they observed that the wild‐type Listeria in the cytoplasm were surrounded by ______________.

Which of the following would be an accurate title for a movie about the mechanism of muscle contraction?

Which property below is most characteristic of intermediate filaments?

Myofibrils in a muscle cell are made up of a repeating linear array of contractile units called ________.

Which region of the sarcomere represents the region of overlap between the two types of filaments in the sarcomere?