Historically, in the field of taxonomy, what characteristic was most commonly used for determining species relationships?
A) Chromosomal similarity
B) Anatomical similarity
C) DNA sequence similarity
D) Geographic proximity
E) Capability of interbreeding
B
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The oceans contain about ________% of the Earth's water.
A. 95 B. 93 C. 91 D. 97
Some flowers have distinctive patterns that only reflect ultraviolet light and therefore are invisible to humans. Which statement about such markings is NOT correct?
A. The ultraviolet patterns are highly visible and attractive to bees. B. Carotenoid pigments are responsible for the ultraviolet patterns. C. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites. D. The ultraviolet patterns repel birds and bats from the flowers. E. Flowers with ultraviolet patterns usually appear yellow or orange to humans.
Acellular vaccines and subunit vaccines
A. are always genetically engineered. B. confer passive immunity. C. contain select antigenic components of a pathogen rather than whole cells or viruses. D. contain modified bacterial exotoxin molecules. E. utilize DNA strands that will produce the antigen.
Genes located near one another on the same chromosome are often inherited together. These are called ________
A) nonsegregated genes B) joined genes C) fused genes D) linked genes