ID #1562

In my lecture notes for lecture 32, I have "In vitro, Both + and - ends polymerize and depolymerize at the same speed. But, in the text book on page 505, it states "Microtubules are polar structures with two distinct ends: a fast growing plus end and a slow growing minus end." And this particular statement is in a paragraph referring to information found in vitro.

it isn't uncommon for me to simplify some of our concepts a little for this course. Call it "artistic license" or something like that. :) What I am far more concerned about us understanding at this point is that the minus end is usually occupied in vivo, which affects its overall behavior. Don't worry about that extra information in your textbook. It's not incorrect, it's just not important for purposes of MCB 150.

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