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25-11-2022
Biology

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A E. coli cell of lacI+lacP+lacOc lacZ-lacY+/lacI-lacP+lacO+lacZ-lacY+will: a) Only express lacY, only in the absence of lactose. b) Always express lacY but not lacZ. c) Never express lacZ or lacY. d) Always express lacZ but not lacY. e) Always express lacZ and lacY.

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