The oceanic zone is represented by letter ____
a. A
b. B
c. C
d. D
e. E
D
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Thomas Bell and his colleagues studied bacterial species richness in isolated European beech treehole basins
("islands"). Their data showed that ______.
a. island size affects beech tree populations b. the number of bacterial species decreases with treehole volume c. the number of bacterial species increases with treehole volume d. large beech trees support higher bacteria populations than small beech trees e. the species-area effects on bacterial species differs from species-area effects on animal and plant populations on true islands
What is the purpose of the intestinal villi and microvilli?
a. increase surface for maximum absorption b. increase surface area for maximum infiltration of capillary beds c. decrease area for bacterial growth d. increase area for bacterial growth e. increase the area for the serosa
The prevention of genetic exchange between two species because they reproduce at different times of
the day or year is called:a. hybrid sterility. b. genetic isolation. c. sexual isolation. d. mechanical isolation. e. temporal isolation
For the numbered steps below, select the option that places them in the correct order.
1) The ribosome binds to the mRNA and uses tRNAs to translate mRNA into the corresponding amino acid polypeptide sequence. 2) The spliceosome removes introns. 3) The primary structure of the polypeptide chain undergoes hierarchical foldings to form the tertiary structure. 4) RNA polymerase binds to the promoter region of a gene and initiates transcription. A) 1 > 2 > 3 > 4 B) 4 > 2 > 1 > 3 C) 3 > 1 > 4 > 2 D) 2 > 1 > 4 > 3