How is the Ug99 strain of wheat stem rust fungus spreading around the world?
a. spores are carried by birds
b. viral vectors carried in insects
c. imported infected wheat
d. wind dispersal of spores
e. an infected plant touches another plant
ANSWER: d
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In a population of Mendel's garden peas, the frequency of green flowered plants (genotype aa) is 49%. The population is in Hardy-Weinberg equilibrium. What are the frequencies of the AA and Aa genotypes?
A. 49% AA, 2% Aa B. 9% AA, 42% Aa C. 42% AA, 9% Aa D. 33% AA, 18% Aa E. Can't determine from this information.
What statement is most likely true about nest decorating behaviors in starlings? a. It will decrease the amount of predation on the fledglings
b. It will always harm the fledglings. c. It has no impact on the fledglings. d. It decreases the amount of competition for nesting sites. e. It may be adaptive for a variety of reasons.
African sleeping sickness is caused by Trypanosoma brucei, a unicellular flagellated protist that infects red blood cells after being injected into the bloodstream. Trypanosoma brucei is which of the following?
A. a diatom B. an alga C. a protozoan D. a slime mold E. an apicomplexan
RNA molecules that function as enzymes
A) form primitive cells. B) are called ribozymes. C) developed from protein-based enzymes. D) degrade proteins. E) duplicate lipid molecules.