The recent epidemic of SARS virus was caused by a(n)
A) adenovirus.
B) rhinovirus.
C) coronavirus.
D) flavivirus.
E) togavirus.
C
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If 1000 millimoles make up a mole, how many grams of magnesium (Mg), which has an atomic mass of 24.305, will make a solution that contains 150 µmol of Mg?
A. 3.6mg. B. 2.4mg. C. 0.24mg. D. 36mg.
How do epithelial cells obtain their nutrients? a. Direct blood supply from an artery
b. Nutrients are delivered by macrophages. c. Direct blood supply from a vein. d. Diffusion from adjacent cells. e. Osmosis of nutrients from underlying tissue.
Which grouping immediately follows Order in the classification hierarchy?
A) Genus B) Family C) Phylum D) Class
Without data from the base composition studies of Chargaff, what might Watson and Crick's modeling studies have erroneously concluded?
A. Bases could pair with themselves (e.g., A with A, C with C). B. Any purine could pair with any purine. C. Any purine could pair with any purine and any pyrimidine could pair with any pyrimidine. D. Any purine could pair with any pyrimidine. E. Any pyrimidine could pair with any pyrimidine.