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

Biology & Microbiology

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________ are the main primary producers in freshwater environments

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PKU is a recessive disorder. If a woman who has PKU has a child, what is the child’s possible

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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

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Norwalk agent is

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