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.
Answer: D
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Which of the following statements about the evolution of animal cell adhesion molecules is true?
A. Animal cell adhesion molecules evolved from protein families that originally performed other functions. B. The genes for integrins are found in all opisthokonts including animals, plants, and fungi. C. The genes for cadherins are only found in animals. D. The genes for integrins are found only in multicellular organisms. E. All of these statements about the evolution of animal cell adhesion molecules are true.
A layer of membrane attached to a virus is called
an envelope. a protein coat. a chromosome. a plasmid. a nucleus
Immediately after a meal, which one of the following is first used by cells as an energy source?
A) fat B) glycogen C) lactic acid D) amino acids E) glucose
The polypeptide-making organelles, which consist of protein combined with RNA, are called
A. lysosomes. B. centrosomes. C. ribosomes. D. Golgi bodies. E. mitochondria.