Chemotaxis is a process by which cells migrate toward higher concentrations of a signaling molecule. The signaling binds cell-surface receptors that result in actin polymerization at the cell membrane. Actin polymerization results in the formulation of filamentous actin that exerts a force and leads to protrusion of the leading edge. A researcher tested Compound A on chemotaxing cells and measured the relative amount of filamentous actin found in the cells at different times. Part C. Based on the researcher's observations on filamentous actin, what other observation regarding cell chemotaxis was MOST likely observed? The cell moved toward the source of the signaling molecule only after the addition of Compound A, the cell moved away from the source of the signaling molecule only after the addition of Compound A, the cell first moved toward and then away form the signaling molecule after the addition of Compound A, or the cell did not move toward or away from the signaling molecule after the addition of Compound A.
Based on the observation of increased filamentous actin, it is most likely that the cell moved toward the source of the signaling molecule only after the addition of Compound A. The actin polymerization and protrusion of the leading edge suggest that the cell is responding to the signaling molecule by migrating towards it.
