The first evidence that the vasodilatory signal molecule was produced by ____ was reported in 1980
a. nitric oxide
b. endothelial cells
c. CO2
d. cardiac muscle cells
e. platelets
ANSWER: b
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Although freshwater biomes cover less than 1% of the Earth's surface, they are important because ________.
A. they are home to lots of species B. we depend on them for drinking water C. they are the source of our irrigation for agriculture D. All of the above are reasons why freshwater biomes are important.
You are observing an organism under the microscope, and it is clearly multicellular with no cell walls. Your prediction is that this organism is a(n) ________.
A. helminth B. bacterium C. alga D. protozoan E. fungus
__________, products of master genes, act as long-range signals that diffuse out from a source and
form a concentration gradient. Fill in the blank(s) with the appropriate word(s).
Four of the five answers listed below are potentially toxic waste products of metabolism. Select the
exception. a. urea b. water c. uric acid d. carbon dioxide e. ammonia