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Answer:
Bacterial cells that contain green fluorescent protein (GFP) will fluoresce under ultraviolet light.
a) the breakdown products of lactose block cell division. The lac operon exhibits both systems. It is a negative control system because expression is typically blocked by an active repressor (the lac repressor) that turns off transcription. The lac repressor binds to the operator region and negatively controls (prevents) transcription.
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