In the viable plate count method, a measured volume of a culture is evenly spread across an agar surface and incubated. Each ________ represents one ________ from the original sample.
A. colony; cell
B. species; colony
C. cell; cell
D. cell; colony
E. generation; cell
Answer: A
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Systemic symptoms, such as fever, weight loss, malaise, and a loss of appetite, along with a widespread rash, can be observed in patients suffering from _________ syphilis
a. primary b. secondary c. tertiary d. latent
Mycorrhizae are especially effective in helping plant roots uptake
A. nitrogen. B. phosphorus. C. potassium. D. iron. E. magnesium.
The many oxidation reactions that take place in our bodies cause the formation of
a. free radicals. b. antioxidants. c. covalent molecules. d. ionic molecules. e. hydrogen bonds
Cavener and Clegg (1981 ) demonstrated natural selection by observing the cumulative change in allele frequencies in populations of Drosophila melanogaster that were subjected to high levels of ________
A) mercury B) carbon dioxide C) alcohol D) sugar E) nitrous oxide