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
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The cornea is part of the
(a) sclera. (b) choroid. (c) retina. (d) lens.
The idea that the adenine and thymine bases of the DNA interact in some manner was first proposed by _______
A. Watson and Crick B. Franklin C. Pauling D. Chargaff
A molecule that is a capable of releasing or donating a hydrogen ion is termed a(n) ____.
A) acid B) hydrion C) pain D) base E anachronism
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.