In formation of plaques by bacteriophages which of the following statements is true?
A. A plaque is the result of several different viruses initially infecting a single cell
B. The plaque is the result of a single virus that has replicated in many bacterial cells in a localized area
C. A plaque results when a single virus infects one cell and then does not infect any other cell
D. Plaques are the areas where cells have not been infected at all
B
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QTL mapping can rely on the relationship between genes for quantitative traits and which of the following?
A. The centromere B. Transposon sites C. Structural genes D. Molecular markers such as RFLPs
Select the pair in which the nitrogenous waste is INCORRECTLY matched with the benefit of its excretion.
A. urea: low toxicity relative to ammonia B. uric acid: can be stored and excreted as a precipitate C. ammonia: very soluble in water D. uric acid: minimal loss of water when excreted E. urea: very insoluble in water
The most toxic substances routinely found in the blood are metabolites of
a. carbohydrates. b. proteins. c. lipids. d. minerals. e. vitamins.
A _____________ is a pill that looks identical to a pill that contains the active ingredient in a scientific trial, but contains no active ingredient itself.
a. capsule b. barbiturate c. placebo d. tablet e. treatment