Place the steps in the correct order to reflect how a lethal dose may be determined. _____ Dilutions of virus are made to represent a range of concentrations. _____ Inoculated host cells are observed and the number of dead cells are counted. _____ The dilution which killed 50% of the tissue culture cells is identified. _____
Dilutions are inoculated into susceptible tissue cultures (or susceptible host organisms).
Fill in the blank(s) with the appropriate word(s).
1, 3, 4, 2
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Chemotherapeutic agents that are artificially produced are most specifically referred to as ________.
A. antimicrobial agents B. semisynthetic drugs C. antibiotics D. synthetic drugs
Your favorite tree is dying, and you find that there is a fungal infection on its leaves. If you were to look at the cells of
the infected leaves of your tree, which structure(s) would you expect to find?
a. mycorrhizae b. arbuscules c. haustoria d. both mycorrhizae and arbuscules e. both mycorrhizae and haustoria
Which of the following enzymes digests fats?
a. pepsin b. catalase c. amylase d. lipase e. trypsin
A major source of naturally produced penicillin is the mold ________.
A. Penicillium familiaris B. Naturally produced penicillin is no longer used. C. Penicillium notatum D. Penicillium chrysogenum