Use the Following Information When Answering the Corresponding Questions)

question 17

Multiple Choice

Use the following information when answering the corresponding questions) .
The mechanism of cell crawling in protist species is not well defined. The textbook states that pseudopodia extension involves interactions between actin and myosin the same molecules that are involved in mammalian muscle contraction) . However, p the study described below, no one had provided convincing data that actin and myosin were actually involved in cell crawlin protists. Anatomical studies had identified the cytoskeletal protein actin just below the surface of the cell membrane in severa of protist, but physiological studies had failed to show a functional link between actin, myosin, and cell crawling.
In a study by N. Poulsen et al. Diatom gliding is the result of an actin- myosin motility system, Cell Motility and the Cytoskeleto 1999) :23- 22) , researchers tested whether motility in a particular species of diatom involves interactions between actin and myosin.
Figure 27.3
-Latrunculin A is a reversible toxin that disrupts the formation of actin fibers. A culture of a particular species of diatom was treated with this toxin diluted in a buffer, while another culture was treated only with the buffer no toxin; control) . The motility of cells in each culture was assessed by counting the number of cells that were moving during a defined period of time. Which of the following conclusion statements is reasonable based on the data in the bar graph above?

• A) In this species of diatom, fully formed actin fibers are necessary for movement.
• B) The buffer alone largely inhibited movement in this species of diatom.
• C) Formation of actin fibers is not necessary for the movement in this species of diatom.

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