Which of the following hypothetical viruses would likely show a "cactus-shaped" population phylogeny?

a. a mutualistic virus that vertically transmitted
b. a highly virulent virus like Ebola that kills its host before the build-up of any immunity
c. a highly virulent virus that results in life-long immunity and that can only infect naïve individ-uals (e.g., young children) that have never encountered any of the virus's strains
d. a virus that can out-evolve widespread immunity via escape mutants


D

Biology & Microbiology

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The idea that the adenine and thymine bases of the DNA interact in some manner was first proposed by _______

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A molecule that is a capable of releasing or donating a hydrogen ion is termed a(n) ____.

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Birds and mammals have a more active lifestyle than reptiles due to

A) insulation over their body surface. B) internal fertilization. C) a slower metabolism. D) internal fertilization and a high, constant body temperature. E) a high, constant body temperature and insulation over their body surface.

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