What factors determine the tree line in alpine areas? Check all that apply.
_____ low temperatures
_____ water availability
_____ pH of soil
_____ high winds
_____ light availability
__X__ low temperatures
__X__ water availability
_____ pH of soil
__X__ high winds
_____ light availability
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What cell type is responsible for the formation of the blood-brain barrier?
A. oligodendrocytes B. interneurons C. Schwann cells D. astrocytes
Social interaction between animals where one individual imposes a penalty on another, and in so doing suffers a loss, is termed ________
A) mutual benefit B) selfishness C) altruism D) spite
Chytridiomycetes produce enzymes that digest cellulose, chitin, and similiar molecules. These fungi are contributing to the decline of amphibians world-wide through what mechanism?
A. by infecting their lungs B. by digesting keratin in the frog's skin C. by killing their eggs in the water D. by digesting chitin in the cell wall of the frog's cells E. by digesting cellulose in the cell wall of the frog's cells
A Gram-positive psychrotrophic rod ________ is a frequent contaminant of dairy products and meat and survives phagocytosis
A) Escherichia coli B) Mycobacterium leprae C) Clostridium perfringens D) Bacillus thuringiensis E) Listeria monocytogenes