A _____ is typically expressed as a percentage, such that the rate base is 100.
a. ratio
b. discrete
c. proportion
d. rate
Ans: c. proportion
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Which of the following is TRUE regarding the step in gene cloning when bacterial cells take up recombinant vector?
A. The process is known as transformation when a viral vector is used. B. The process is known as transfection when a plasmid vector is used. C. The cell is treated with agents that render it impermeable to the plasmid. D. The cell is treated with agents that render it permeable to the plasmid. E. Most cells will successfully take up one plasmid.
Of the belemnites thought to be extinct, the Challenger Expedition discovered the living fossil genus:
a. Spirula. b. Latimeria. c. Neopilina. d. Calyptegena.
A biome characterized by cold temperatures, little precipitation, and ground that is frozen for the majority of the year is called the ________.
A. taiga B. desert C. temperate deciduous forest D. tundra
A little girl was playing in the snow one day and found that she was wiping her nose quite often. The "runny nose" that she was experiencing due to the cold temperatures resulted from
A) an insufficient production of mucus. B) an inadequate supply of blood to the nasal epithelium. C) the slowed activity of nasal cilia. D) a buildup of tears in the nasal septum. E) the inability of the sinuses to drain.