Phage typing is based on the fact that
A) bacteria are destroyed by viruses.
B) viruses cause disease.
C) bacterial viruses attack only members of a specific species.
D) Staphylococcus causes infections.
E) phages and bacteria are related.
C
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Which of the following occurs during suction feeding in fishes?
A. Prey is trapped in the mouth and broken up by pharyngeal jaws in the pharynx. B. Prey is trapped in mucus on the gills and swept into the gut by cilia. C. Prey is captured in blades of baleen and then transferred to the gut. D. Prey is scraped off of rocks with grazing teeth. E. All of the answer options are correct.
Which of the following bases is not found in RNA?
A. adenine B. guanine C. thymine D. cytosine E. uracil
The maximum density of pure water occurs at:
a. -2° C. b. 0° C. c. 3° C. d. 4° C. e. -4° C.
A population of grasshoppers in the Kansas prairie has two color types: green and brown. Typically, the prairie receives enough rainfall to maintain healthy, green grass. Assume a bird species that eats grasshoppers moves into the prairie
How will this affect the natural selection of the grasshoppers? How might this change in a drought year, when the grass turns brown?