The pyramid of energy is
a. a demonstration of the first law of
thermodynamics.
b. a result in the decline in the energy
available as energy travels through the
trophic levels.
c. fundamentally different from the pyramid
of biomass and the pyramid of numbers.
d. just one of the manifestations of
competition.
e. the result of eating the correct foods
B
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DNA probes have been very useful in
A. coding the DNA of organisms grown in vivo. B. identifying organisms in pure culture. C. detecting toxins. D. diagnosing diseases of protozoa.
The dermal endoskeleton of echinoderms is made of
a. cartilage. b. bone. c. calcium carbonate. d. chitin.
Your abdominal cavity, which contains most of your major organs, is a:
a. coelom lined by endoderm and mesoderm. b. pseudocoelom lined by mesoderm. c. pseudocoelom lined by endoderm. d. coelom lined by ectoderm. e. coelom lined by mesoderm.
In the figure below, the cell is _____ to the solution. If the membrane is permeable to water, but not to solutes, net movement of water will be _____ the cell. (Note that the units mM represent the total concentration of solute in the solution.) Inside the cell is 285 mM and outside the cell is 500 mM.
a) hypotonic; out of b) hypertonic: out of c) hypotonic: into d) hypertonic: into