The process by which the sun's energy generates a water potential difference causing water to evaporate from leaf surfaces is called
a. root pressure
b. transpiration
c. osmosis
d. adhesion of water molecules
e. cohesion of water molecules
Answer: b. transpiration
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Territorial behavior provides a specific example of ____, the conveyance of information to other individuals
a. taxis b. kinesis c. habituation d. communication e. imprinting
Water temperature, and therefore global warming, plays a vital role in: a. population stocks
b. none of these choices. c. species distribution. d. species diversity.
Some dogs have erect ears; others have drooping
ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. If two dihybrids are crossed, a. the most common phenotype is drooping ears and barking. b. all droopy-eared, silent offspring are purebreeding. c. the least common phenotype is drooping ears and barking. d. there will be no phenotypes or genotypes that resemble the original parents. e. there will be no offspring that resemble the F1 generation.
If a person is treated with a single anti-HIV drug, they often end up with a resistant strain. How does this occur?
a. The drugs weaken the immune system, making a patient more susceptible to infection with resistant strains of HIV b. The drug causes mutations in the HIV, making them resistant to the drug c. The drugs kill all sensitive viruses, leaving only the pre-existing resistant viruses d. The HIV wants to avoid the drug, so it becomes resistant