Ferns lack:a
rhizomes.
b. seeds.
c. vascular tissue.
d. sexual reproduction.
e. photosynthesis.
B
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You are trying to determine if honeybees have social immunity to nosema, an economically devastating parasite that attacks adult honeybees. You mark some honeybees with a spot of red dye and expose them to a solution containing a sublethal dose of the parasites. Another set of honeybees is exposed to the same solution without parasites. After this exposure, you mix some of the unmarked bees with
the marked bees (Mixed Group). The rest of the unmarked bees are not mixed with other bees (Unmixed Group). When you expose both the Mixed and Unmixed groups of bees to a lethal dose of the parasite, all the bees die. What might you conclude from this experiment? A. The marked honeybees exposed the unmarked bees to a lethal dose of the parasite. B. There is no social immunity for nosema in honeybees. C. There is social immunity, but only at a sublethal dose. D. There is no social immunity, but there is humoral immunity. E. There is both social and nonspecific immunity for nosema in honeybees.
Which of the following flagellates has a single nucleus in the cyst and the typical curved, cytostomal fibril, which is called a shepherd's crook?
a. G. duodenalis b. C. mesnili c. D. fragilis d. E. hominis
What limits cell size?
What will be an ideal response?
Which is the physical basis for creating genetic variation in offspring as a result of meiosis?
a. Genetic mutation b. Independent assortment c. Fertilization d. Cytokinesis