In a fifty-two card deck, the chances of drawing the only ace of spades are
A. 1/4.
B. 1/52.
C. 1/13.
D. 1/26.
B. 1/52.
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Gram stain smears of urethral exudates for the detection of Neisseria gonorrhoeae are highly specific
Indicate whether the statement is true or false.
In mitosis, the main difference between plant and animal cells is that
A. plants do not undergo cytokinesis. B. plants produce a cell plate to segregate the daughter nuclei, while animals form a cleavage furrow. C. plants have a central vacuole, while animal cells do not. D. plants produce a cell membrane in cytokinesis, while animals form a cell plate. E. in plants, kinetochore microtubules shorten and draw chromosomes toward the poles; in animals, polar microtubules lengthen to push chromatids apart.
P. vivax is suspected in a patient who has been traveling for months in the tropics. Blood was collected in a lavender top tube; however, the slide was not prepared for examination until the next day because the specimen came in on the night shift. Once the slide was prepared and ex-amined, Schüffner dots were not visible. Which one of the following statements explains this discrepancy?
a. Schüffner dots are not characteristic of P. vivax infections. b. The blood film was most likely incorrectly prepared. c. The blood should have been collected in a red top tube. d. The blood remained in the tube too long, yielding false-negative results.
Most bony fishes have a hard plate that covers the gills on each side of the head called the
A. pharyngeal slits. B. radula. C. gill arches. D. operculum. E. lateral lines.