The Same Hormone Has Considerably Different Effects in Different Species

question 44

Multiple Choice

The same hormone has considerably different effects in different species. The hormone thyroxin 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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Definitions:

Discrimination

Unfair or prejudicial treatment of people based on differences such as race, gender, age, or sexual orientation.

Conditioned Stimulus

A stimulus that was neutral at first but becomes associated with an unconditioned stimulus to trigger a conditioned response after conditioning.

Generalization

A process in learning where the response is to spread from one specific stimulus to other stimuli that resemble the original.

Acquisition

The process of learning or gaining knowledge, skills, or responses through study, experience, or teaching.