Which biofuel crop yields the greatest amount of energy for the lowest cost?
1.Soybean biodiesel
2.Grass synfuel
3.Corn grain ethanol
4.There is no significant difference among the three crops.
2
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The action spectrum of higher plants is bimodal, with two major peaks. Which two molecules largely determine the
two peaks?
a. photosystems I and II b. P680 and P700
c. chlorophyll a and chlorophyll b d. chlorophyll and carotenoid e. ATP and NADH
Malpighian tubules are found in
a. annelids. b. mammals. c. flatworms. d. insects. e. larval mollusks.
The simplest measure of community structure is a count of the number of species present and is referred to as species ________
Fill in the blank(s) with correct word
All of the following are advantages of gas exchange in air, as compared to gas exchange in water,
except:a. air is less dense than water. b. air contains a higher concentration of oxygen. c. less energy is needed to move air over a gas exchange surface. d. oxygen diffuses more slowly through air than water. e. air is less viscous than water.