Motor proteins are able to generate force by ___________.

undergoing a series of conformational changes

Why does an actin thin filament manage to move continuously during a contraction cycle?

All of the myosin heads beat out of synchrony with one another.

In what form are proteins and neurotransmitters usually transported down the axon of a nerve cell?

inside transport vesicles

A(n) ________ motor, like muscle myosin (myosin II) and unlike myosin V, remains in contact with its track, in this case the thin filament, for only a small portion, less than 5 percent, of the overall cycle.

nonprocessive

Nucleation of microtubules takes place rapidly inside a cell, where it occurs in association with a variety of specialized structures called _____________.

All of the provided answers

The central, rod-shaped domain of an intermediate filament is flanked on each side by globular domains of variable size and sequence. What structure forms the core of the central, rod-shaped domain?

alpha-helix

EDTA is a chemical that binds to and removes (chelates) divalent cations from solution. Treatment of isolated axonemes with EDTA leads to the removal of the inner and outer arms extending from the A microtubules of the axoneme. Which of the following statements wouls appear to be true based on this information?

Magnesium ions are required for dynein to bind to the A tubules of the axoneme.

Which of the following appears to be the most extensible?

intermediate filaments

What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin?

The cells of the neural plate elongate normally but do not become constricted as usually happens.

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

plectin