A microbiologist makes a fixed smear of bacterial cells and stains them with Loeffler's methylene blue. All the cells appear blue under the oil lens. This is an example of
What will be an ideal response?
simple staining
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Which of the following represents an effective method for controlling yeast populations in a test sample?
a. constant stirring to break up biofilms b. percolating oxygen through the sample c. adding antibiotics to the test sample d. adding enzymes to inhibit mating factor
Which of the following lies beneath the C horizon in soil?
a. bedrock b. O horizon c. soil base d. water table
Most or all protist cells have
a. a nucleus. b. a cytoskeleton. c. larger ribosomes than those of prokaryotes. d. mitochondria, ER, and Golgi bodies. e. all of these.
Energy stored in which of the following molecules is converted by mitochondria to a form usable by
the cell? a. water b. organic compounds c. NAD d. ATP e. carbon dioxide