When the pollen of one plant species will not germinate on the flower of another species, it is an example of
A) temporal isolation.
B) hybrid inviability.
C) hybrid infertility.
D) hybrid vigor.
E) gametic incompatibility.
E
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The figure below shows three mouse populations and their associated changes in the frequency of B, the allele for dark fur. The recessive b allele codes for white fur. After 20 generations, in which population would you be most likely to encounter a white mouse? 
A. N2 B. N3 C. There is an equal probability of encountering a white mouse in all three populations. D. There is an equal probability of encountering a white mouse in populations N1 and N3 and this is higher than in N2. E. N1
Bacterial cells could have any of the following appendages, except
A. periplasmic flagella (axial filaments). B. sex pili. C. cilia. D. fimbriae. E. flagella.
In order to form a single molecule of glucose, it takes ________ turns through the reactions of the Calvin-Benson cycle.
A. 12 B. 6 C. 4 D. 3
A small number of cell surface receptors can ultimately generate a large intracellular response due to activation of kinase cascades. This is referred to as:
A. signal transduction. B. signal dampening. C. signal activation. D. signal amplification.