The total solute concentration of a solution of water and other substances (salts, proteins, etc.) is referred to specifically as its
A. osmolarity.
B. tonicity.
C. salinity.
D. specific gravity.
E. density.
A. osmolarity.
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Tetrazolium chloride is used by the seed industry to indicate
(a) if a seed is undergoing photosynthesis. (b) if seeds are undergoing aerobic respiration. (c) if seeds are alive. (d) both b and c.
Why is one side of a single water molecule partially negative while the other side is partially positive?
A) Electron pairs are unevenly shared between the oxygen atom and the two hydrogen atoms. B) Electron pairs are unevenly shared between the two hydrogen atoms. C) Oxygen donates its electrons to hydrogen. D) Hydrogen donates its electrons to oxygen.
A 5-year-old boy has bloody diarrhea for 2 days, nausea, abdominal cramps, and vomiting. He subsequently undergoes acute renal failure. Upon questioning the mother, it is learned that the diarrhea started 24 hours after the child had eaten a hamburger at a fast-food restaurant. Which of the following is the likely cause of this disease?
A. Bacillus cereus B. Vibrio cholerae C. Escherichia coli strain O157:H7 D. Staphylococcus aureus E. Salmonella typhi
Helical and icosahedral are terms used to describe the shapes of a virus
A. envelope. B. spike. C. core. D. capsid. E. capsomere.