Why are lichens a good indicator of environmental quality?
A. Toxins inhibit their reproduction.
B. If the air is polluted, they cannot get enough sunlight for photosynthesis.
C. If the soil is polluted, they cannot produce roots.
D. They cannot absorb toxins.
E. They cannot excrete absorbed toxins.
E. They cannot excrete absorbed toxins.
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Aristotle's lantern is a tooth-bearing structure of the
a. sea stars. b. tunicates. c. acorn worms. d. sea urchins.
Molecules assisted by carrier proteins may cross a selectively permeable membrane by
A) facilitated diffusion. B) active transport. C) osmosis. D) simple diffusion. E) endocytosis.
Injecting DNA into cells can be accomplished using
A) nitrocellulose membranes. B) silicon chips and nucleic acids. C) compressed air and gold beads. D) micropipettes. E) micropipettes, or compressed air and gold beads.
The Great Dane and Chihuahua are both domestic dogs, the same species. However, mating between them is limited by:
A) hybrid infertility. B) behavioral isolation. C) mechanical incompatibility. D) heterozygote disadvantage.