High ____ concentrations in Lake Erie encouraged the growth of photosynthetic algae, which changed the

phytoplankton community.



a. sewage
b. detergent
c. coliform bacteria
d. phosphorous
e. dead fish


ANSWER: d

Biology & Microbiology

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It is thought that viruses may have originated from cells because ____

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Which of the following achieves sterilization in the shortest period of time?

A. autoclaving B. boiling C. batch method pasteurization D. an oven at 171°C E. ultra-high-temperature sterilization

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