The diphtheria component of the DTaP vaccine is a(n)
A) toxin.
B) toxoid.
C) antitoxin.
D) antitoxoid.
Answer: B
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When this exercise was written, the media campaign in support of golden rice was being launched. Search the Internet for the roots of the controversy over this genetically enhanced plant. Brie?y describe the bene?ts of, and the concerns over, its introduction to the rice-growing areas of the world.
What will be an ideal response?
How did researchers test if flatworms could moderate the immune system?
A. exposing white blood cells to flatworm antigens and measuring interleukin-10 concentrations B. exposing white blood cells to dust mite antigens and measuring interleukin-10 concentrations C. exposing white blood cells to flatworm antigens and measuring histamine concentrations D. exposing white blood cells to dust mite antigens and measuring histamine concentrations E. infecting children with flatworms and looking at their number of white blood cells
Which nitrogenous waste product would be least toxic to an embryo developing in the aqueous environment found
inside a shelled egg? a. ammonia b. urea c. uric acid d. amino acids e. purines
The fluid material located outside of the nucleus is the
A. vacuole. B. protoplasm. C. cytoplasm. D. nucleoplasm.