The explanation for the differences between a human

liver cell and a cell from the skin is the
a. maternal and paternal origins of the genes.
b. gene content of the two cells.
c. expression of the genes in the two cells.
d. fact that they originated from different primary
tissue layers.
e. different functions of the cells.


Answer: c

Biology & Microbiology

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a. True b. False

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Local cave explorers, returning from a recent expedition, reported discovering piles of dead bats with white froth around their mouths that they believed to be indicative of an outbreak of rabies. Subsequent testing revealed the ‘”froth” was actually a fungus, and the bats were in fact afflicted with white-nose syndrome. What species of fungus causes white-nose syndrome?

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A group of three mRNA nucleotides that translate to an amino acid is called a(n) 

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A. Occurs only when the membrane is permeable to the solute. B. requires the presence of a transmembrane protein. C. is a spontaneous process. D. requires energy. E. is the process by which molecules move from an area of low concentration to an area of high concentration.

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