Structurally similar RTKs have been found in all multicellular animals, suggesting that ____
a. RTK genes are resistant to mutation
b. RTKs evolved relatively early in the history of animals
c. RTKs evolved from G proteins
d. RTKs are not involved in vital processes in animals
e. RTKs have evolved independently of each other in animals
ANSWER: b
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Fill in the blank(s) with the appropriate word(s).
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EXCEPT a. southern China. b. 1/3 of the United States. c. Australia. d. Hawaii. e. all of these.