The biggest issue facing the successful production of influenza vaccines is that ________
A) flu virus populations evolve rapidly
B) flu vaccines can take months to prepare
C) researchers must successfully predict which flu strain(s) will survive from among the existing strains to become the next season's epidemic
D) All of these are serious issues.
E) Generalized vaccines are easy to produce; none of these are serious issues.
D
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The ________ chains are structurally distinct for each immunoglobulin class.
Fill in the blank(s) with the appropriate word(s).
Molecules that absorb light are called
A. enzymes. B. pigments. C. photosynthesizers. D. electron carriers. E. absorbers.
Polypeptides are composed of many
A. amino acids. B. carbohydrates. C. nucleic acids. D. fatty acids.
The Island of Krakatau has provided an ideal setting for studies of which kind of succession?
A) primary B) secondary C) tertiary D) quaternary