If an ovary contains 50 ovules, what is the minimum number of pollen grains that must land to form 50 mature seeds?
A) 25
B) 50
C) 100
D) 500
B
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Referring to Figure 10.17 if necessary, identify which type of cell-cell interaction is most likely to force the products of digestion to be absorbed across microvilli of intestinal cells rather than allowing them to leak between cells
A. gap junctions B. tight junctions C. plasmodesmata D. hemidesmosomes E. desmosomes
Some species of aquatic bacteria use inclusion bodies known as ________ to orient themselves in Earth's magnetic field.
Fill in the blank(s) with the appropriate word(s).
In the United States, parathion is the most widely used member of a class of ____
a. organophosphate herbicides b. organophosphate insecticides
c. chlorophosphate fungicides d. chlorophosphate herbicides e. chlorophosphate insecticides
Which of these groups is NOT monophyletic?
a. Animalia b. Protista c. Plantae d. Fungi