In the African savanna, fire helps maintain the dominant vegetation
____________________ Indicate whether the statement is true or false.
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All of the following are general components of the growth factor signaling pathway EXCEPT
A. tyrosine kinase-linked receptor. B. GRB2-Sos-Ras complexes. C. phosphorylated transcription factors. D. Raf-1. E. IP3 and Ca2+.
Your parents are both heterozygous for the recessive disorder phenylketonuria (PKU). What is the probability that you
will have the disorder?
a. 25% b. 50% c. 75%
d. 100% e. 25% if your three siblings are healthy; 75% if your siblings also have the disorder
A physical barrier that separates a population
in half and that leads to the evolution of a new species is called
a. sympatric speciation. b. allopatric speciation. c. directional selection. d. ecological isolation. e. behavioral isolation
The largest hole in the ozone layer occurs in the stratospheric layer over
A) the Amazon rainforests. B) the eastern coast of the United States. C) the western coast of the United States. D) Africa and South America. E) Antarctica.