Prolactin Is a Hormone Whose Molecular Structure Has Remained Stable

question 53

Multiple Choice

Prolactin is a hormone whose molecular structure has remained stable over evolutionary time but whose hormonal role has changed dramatically in different animal species. This is an excellent example of how evolution

• A) is responsible for mutation in vertebrates.
• B) occurs rapidly at the molecular level to keep up with changing environmental influences.
• C) has stayed within narrow boundaries in regard to regulation of homeostasis.
• D) can both preserve unity and promote diversity.

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