The electron micrographs shown in Figure Q17–20A were obtained from a population of microtubules that were growing rapidly. Figure Q17–20B was obtained from microtubules undergoing “catastrophic” shrinking. Comment on any differences between A and B, and suggest likely explanations for the differences that you observe.

Transcribed Image Text:

(A) Figure Q17-20 (B) (Micrographs courtesy of Eva Mandelkow.)