front 1 Motor proteins are able to generate force by ___________. | back 1 undergoing a series of conformational changes |
front 2 Why does an actin thin filament manage to move continuously during a contraction cycle? | back 2 All of the myosin heads beat out of synchrony with one another. |
front 3 In what form are proteins and neurotransmitters usually transported down the axon of a nerve cell? | back 3 inside transport vesicles |
front 4 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. | back 4 nonprocessive |
front 5 Nucleation of microtubules takes place rapidly inside a cell, where it occurs in association with a variety of specialized structures called _____________. | back 5 All of the provided answers |
front 6 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? | back 6 alpha-helix |
front 7 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? | back 7 Magnesium ions are required for dynein to bind to the A tubules of the axoneme. |
front 8 Which of the following appears to be the most extensible? | back 8 intermediate filaments |
front 9 What would happen if you cultured a frog embryo just after gastrulation in the presence of cytochalasin? | back 9 The cells of the neural plate elongate normally but do not become constricted as usually happens. |
front 10 The cross-bridges that hold intermediate filaments together are composed of _______. | back 10 plectin |