Which forms of nitrogen are readily usable by plants?
a. NH4
+ and NO3
?
b. NH4
+ and NO2
?
c. N2 and NH3
d. NH4 and NH3
e. NO3
? and NO4
?
A
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Refer to the paragraph on Rhodopsins. Which of the following best describes this particular protein?
A) integral B) peripheral C) external D) internal
A shift from expected allele frequencies, resulting from chance, is known as
(a) natural selection. (b) genetic drift. (c) mutation. (d) gene flow.
The most species rich communities are found
in
a. tropical rain forests. b. hot deserts. c. eastern deciduous forests. d. grasslands. e. northern coniferous forests
Blood in the veins looks purplish because ____
a. it contains less oxygen than arterial blood b. most of the oxygen is dissolved in the plasma c. less oxygen is in the plasma compared to bound to hemoglobin d. it contains less carbon dioxide e. veins run deeper than arteries