Which of the following statements about eosinophil function is CORRECT?
A) They produce defensins.
B) They secrete toxins onto virally infected cells.
C) They are involved in the removal of neoplastic cells.
D) They attach to the surface of parasitic helminths and produce toxins that kill the parasite.
E) They identify and spare normal cells.
D
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The absorptive epithelia in the gut are considered "polarized" because _____
A) thick and thin filaments are present B) they pump wastes into the lumen while pumping nutrients toward the blood C) the colors seen on the top and bottom of the cells are different D) they must fire action potentials to absorb most nutrients E) the apical surface is different from the basal surface
Four of the following statements about Sinosauropteryx are true. Which statement is false?
a. It was likely flightless. b. It was found in China. c. It lived more recently than Archaeopteryx. d. It was a small dinosaur. e. It had short forelimbs.
During telophase, ________
A) the events of prophase are reversed B) chromosomes line up in the middle of the cell C) sister chromatids become separate chromosomes D) the nuclear envelope breaks up
Suppose you are a botanist and you discover a plant that has a small free-living gametophyte that requires external water for fertilization and a large free-living sporophyte. The free-living sporophyte eventually releases spores from sporangia on the margins of its leaves. Into which group should you classify this plant?
a. gymnosperms b. angiosperms c. seedless vascular plants d. bryophytes