Patch tests are used to detect
A. hives.
B. serum sickness.
C. immune complexes.
D. contact hypersensitivity.
D
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Which cells relay messages from photoreceptor cells to non-photoreceptor cells?
a. optic ganglion cells b. amacrine cells c. bipolar cells d. rods and cones e. horizontal cells
Which of the following structures found in a
monocot seed is NOT found in a eudicot seed?
a. seed coat b. endosperm c. cotyledon d. coleoptile e. all of these structures are found in both monocot and eudicot seeds
Which of the following statements is NOT
TRUE? a. Photons are packages of solar energy. b. Each photon consists of a fixed amount of energy. c. The least energetic photons travel in longer wavelengths. d. Photons with different energy levels are perceived as exhibiting different colors. e. Photons of visible light have wavelengths shorter than 350 nanometers
Horses and donkeys can breed and produce sterile offspring known as mules. Horses and donkeys remain separate species because of this hybrid sterility, which is:
A. an allopatric barrier to reproduction. B. a sympatric barrier to reproduction. C. a prezygotic barrier to reproduction. D. a postzygotic barrier to reproduction.