Two cats getting ready to fight puff up their fur to make themselves look larger. This is an example of
A) imprinting.
B) minimized competition.
C) pheromones.
D) aggressive behavior.
E) altruism.
D
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Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce_____.
A) all sharp-spined progeny B) 50% sharp-spined, 50% dull-spined progeny C) 25% sharp-spined, 50% dull-spined, 25% spineless progeny D) all spineless progeny E) It is impossible to determine the phenotypes of the progeny.
The most common method of transfer of antimicrobial resistance is through the use of
A. viruses. B. R plasmids. C. introns. D. exons.
Normally, complement proteins are active until the body is exposed to antigen
____________________ Indicate whether the statement is true or false.
In using which of the following lenses should the diaphragm be almost completely open to maximize resolution?
A) low power B) high dry C) oil immersion