Which aspect of truffle mushrooms drives their commercial importance?
A) size
B) smell
C) taste
D) texture
B
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Assume that a pinhead is 1 mm in diameter. How many spherical bacteria (cocci), lined up side- by-side, would fit across the pinhead.
A) 100 B) 1,000 C) 10,000 D) 100,000
The heart in a human embryo begins to beat about ____ after fertilization
a. 5 days b. 3 weeks c. 7 weeks d. 9 weeks e. 12 weeks
HEPA filters are used to remove microbes from
A. air. B. liquids. C. medical instruments. D. human tissues. E. All of the choices are correct.
A researcher examines a microsatellite locus in a wild population of D. melanogaster. She finds that in a sample of 50 individuals, 35 different alleles are segregating. The best explanation for the presence of all of these alleles is:
a. balancing selection. b. mutation. c. the neutral theory. d. overdominance. e. the law of large numbers.