What evidence was used by scientists to deduce the climate conditions that existed thousands of years ago?
A) plant remains trapped in sediments
B) fossilized fruits and seeds
C) DNA in crop plants
D) deep layers in soils
A
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The unique antigenic determinants of the 90 serotypes of Streptococcus pneumoniae are found
A) on the cell-surface M proteins. B) on the capsular polysaccharides. C) in the bacterial cell wall. D) in the inclusions in the periplasmic space.
An organism's genome is analyzed and found to contain 18% thymine. What percentage of that organism's DNA is cytosine?
A. 32% B. 18% C. 82% D. 64% E. 36%
Absolute zero
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Human embryos differ from bird embryos in that
A) bird embryos undergo metamorphosis to become sexually mature adults. B) bird embryos have an extra membrane, the allantois, that is not found in human embryos. C) human embryos have a yolk sac, but it contains very little yolk. D) human embryos do not undergo cleavage. E) human embryos have no yolk sac.