The Same Hormone Has Considerably Different Effects in Different Species

question 3

Multiple Choice

The same hormone has considerably different effects in different species.The hormone thyroxine in humans stimulates metabolism,but in frogs it induces metamorphosis from tadpole to adult frog.This indicates that

• A)the target tissues have evolved different responses.
• B)metamorphosis is caused by a change in body metabolism.
• C)the organisms have absolutely no evolutionary relationship.
• D)the chemical composition of the hormone is actually slightly different.
• E)the origin of the hormone makes a difference in the effect the hormone has on target tissues.

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