Question

Description acceptable. This process was modeled by Gray and Hancock’s resistive force theory, which requires an anisotropic drag coefficient. A 1951 theory of this process by G. I. Taylor showed that a traveling waveform is optimal and argued that agents could hydrodynamically synchronize during this process. A parameter beta expresses the ratio of dipole and quadrupole contributions to the “force-free” type of this process in an earlier theory of Lighthill, whose (*) “squirmers” may be characterized as pushers or pullers. (-5[1])The time reversibility of the Stokes equations were used by Purcell in the paper “Life at Low Reynolds (10[1])Number” to show that this process (10[2])requires non-reciprocal (10[3])motion, (10[1])per the scallop theorem. The optimal (10[1])shape for one appendage (-5[1])used (10[1])in this process (10[1])is a corkscrewing rigid helix. (10[1])For 10 points, E. coli have a “run-and-tumble” strategy (10[1])in what process achieved using flagella? ■END■ (10[3])

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