Most biosynthetic operons need only be under negative control for effective regulation, whereas most catabolic operons need

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Most biosynthetic operons need only be under negative control for effective regulation, whereas most catabolic operons need to be under both negative and positive control. Why?
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Brock Biology of Microorganisms

ISBN: 978-0321897398

14th edition

Authors: Michael Madigan, John Martinko, Kelly Bender, Daniel Buckley

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