In the African savanna, fire helps maintain the dominant vegetation

____________________ Indicate whether the statement is true or false.


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Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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+.

Biology & Microbiology

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

Biology & Microbiology