What is the minimum number of phage that can initiate the development of a plaque in a bacterial lawn?
A. 25
B. 10
C. 1
D. 5
Answer: C
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A cell that responds to an environmental condition by the release of a chemical is an example of which of the following elements of cellular communication?
A. a signaling cell B. a signaling molecule C. a receptor molecule D. a responding cell E. None of these choices is correct.
What is an assumption of group selection?
A. infanticide B. lack of immigration C. no natural selection D. high rates of mutation E. resource prediction
Which of the following is TRUE with regard to a DNA molecule?
A) The amount of adenine is equal to the amount of guanine, and the amount of thymine is equal to the amount of cytosine. B) The amount of adenine is equal to the amount of cytosine, and the amount of guanine is equal to the amount of thymine. C) The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of uracil. D) The amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine.
One way that substances move between blood and interstitial fluid is by
A) alternatively breaking and regenerating membranes of cells lining capillaries. B) osmosis. C) pressure-driven flow through clefts between the epithelial cells of the capillary wall. D) active transport utilizing ATP.