Dynamic range of environmental qualities

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Question: Why might phenylalanine produce a false negative for the Xanthoproteic test? I know it has a benzene ring and should test positive, but I need a reason(s) it may behave differently. All I can come up with is human error.

Question: Explain how does homeostasis maintain a dynamic range of environmental qualities rather than hold the internal environment at a set point?

Reference no: EM1393246

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