Localized areas of destruction occurring on plants that have been infected by a virus are referred to as ________ lesions.
Fill in the blank(s) with the appropriate word(s).
necrotic
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The concentrations in a broth dilution test that separate the categories of susceptible, intermediate, and resistant are called:
a. border concentrations. b. tolerance limits. c. breakpoints. d. reference values.
The DNA phage ??174 was found to have a ratio of bases of 25A:33T:24G:18C. This departs from the usual A/T = 1 and G/C = 1 ratios. How can you explain this?
What will be an ideal response?
Denitrifying bacteria:a
make nitrogen available for assimilation. b. decompose organic nitrogen compounds into nitrate. c. decompose organic nitrogen compounds into ammonia. d. fix nitrogen into ammonia. e. convert nitrate into atmospheric nitrogen.
The process of fossilization typically begins when an organism or traces of it ____.
A. settle on the seafloor B. are pressurized under the weight of sediment C. crystallize into minerals D. are saturated with groundwater E. become covered with sediments, mud, or ash