1. It is first important to understand the logic behind operons. Think about the

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1. It is first important to understand the logic behind operons. Think about these questions: If specific enzymes function to break down lactose, is it energetically efficient (or logical from an energy . Is it energetically efficient for the cell to produce glucose by hydrolyzing lactose if a supply of glucose is .E. coli produce tryptophan as the end product of a series of five reactions. This requires considerable standpoint) for the cell to produce those enzymes when lactose is not present? already present in the cell? energy expenditure. What would happen if the bacteria came upon a source of ready-made tryptophan in their environment?

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