The increase of toxins as they move up through
the food chain is called
a. bioaccumulation.
b. eutrophication.
c. salinization.
d. escalization.
e. desertification
A
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________ are the main primary producers in freshwater environments
A) Phototrophic microorganisms B) Heterotrophic microorganisms C) Chemolithotrophic microorganisms D) Viral microorganisms
PKU is a recessive disorder. If a woman who has PKU has a child, what is the child’s possible
genotype? A. Homozygous dominant. B. Homozygous recessive. C. Heterozygous. D. The genotype could be any one of these. E. There is not enough information to determine the child’s genotype.
0.2 mls of a 10-4 dilution of a virus preparation yields 90 plaques. What is the number of PFU per ml in the undiluted virus preparation?
A. 4.5 × 107 B. 9.0 × 108 C. 4.5 × 106 D. 9.0 × 105
Norwalk agent is
A. a common enteric virus of gastroenteritis. B. transmitted orofecally. C. a calicivirus. D. sometimes acquired from contaminated water and shellfish. E. All of the choices are correct.