Cilia are part of the protective barrier located in the:
A. respiratory tract.
B. skin.
C. stomach.
D. genitourinary tract.
A
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A new species, ________, was recently shown to have two membranes, like a Gram-negative bacterium, but be phylogenetically related to the Gram-positive family Veillonellaceae.
Fill in the blank(s) with the appropriate word(s).
Optimal foraging as a form of efficient behavior would be favored by
A. associative learning. B. operant conditioning. C. energy expended. D. natural selection. E. None of these choices are correct.
Some lichens can reach ages of at least
A. 2 years. B. 10 years. C. 100 years. D. 450 years. E. 4,500 years.
What is meant by the description "antiparallel" regarding the strands that make up DNA?
A) The twisting nature of DNA creates nonparallel strands. B) The 5' to 3' direction of one strand runs counter to the to direction of the other strand. C) Base pairings create unequal spacing between the two DNA strands. D) One strand contains only purines and the other contains only pyrimidines.