Dr. Robert Macnab of Yale University concluded a major 50 page review of the sensory and motor mechanism of the bacterium, E. coli, with these remarks:
As a final comment, one can only marvel at the intricacy in a simple bacterium, of the total motor and sensory system which has been the subject of this review and remark that our concept of evolution by selective advantage must surely be an oversimplification. What advantage could derive, for example, from a "preflagellum" (meaning a subset of its components), and yet what is the probability of "simultaneous" development of the organelle at a level where it becomes advantageous (Macnab, 1978)?
Macnab, R. (1978)
"Bacterial Mobility and Chemotaxis: The Molecular Biology of a Behavioral System"
CRC Critical Reviews in Biochemistry, vol. 5, issue 4, Dec., pp. 291-341
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