what depresses NK cells?
What will be an ideal response?
carcinogens and psychological stress
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The consequence of an infection by a temperate bacteriophage is that the bacterial cell
A) lyses before it gets a chance to divide. B) never lyses but continues to divide and replicate both the virus and the cell. C) divides faster at moderate temperatures. D) may lyse before it divides or may continue to divide and replicate both the virus and the cell.
Which of the following statements about communication in the White-Crowned Sparrow is not correct?
A. The White-Crowned Sparrow's song is an advertisement display behavior. B. The White-Crowned Sparrow's song is learned by imprinting, a sensitive period that takes place about 10–50 days after hatching. C. During the learning phase, the White- Crowned Sparrow's subsong is a sequence of unstructured twittering. D. If a tape of another species song, for example the Swamp Sparrow, is played during the sensitive period, the White- Crowned male will learn that song. E. If deprived of hearing the adult male's song during the early sensitive period, the bird will continue to sing an unstructured twittering throughout its life.
To increase the sensitivity of direct Gram-stain examination of body fluid specimens, the specimens are usually:
a. incubated for 18 to 24 hours before stain-ing. b. centrifuged before staining. c. examined for at least 1 hour. d. stained for an additional 5 minutes.
What type of tooth shears off bits of food?
a. incisors b. canines c. premolars d. molars e. dentin