An insect that exhibits resistance to a pesticide
a. developed the resistance in response to the pesticide.
b. mutated when exposed to the pesticide.
c. inherited genes that made it resistant to the pesticide.
d. drifted from an adjacent field.
e. received resistance genes during mating.
C
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Two species of antelope ground squirrels are separated by the Grand Canyon. They are hypothesized to descend from a common ancestor, populations of which were separated as the canyon formed. If this hypothesis is correct, it would be an example of:
A. allopatric speciation by dispersal. B. allopatric speciation by vicariance. C. peripatric speciation by vicariance. D. sympatric speciation by dispersal. E. sympatric speciation by vicariance.
Which of the following virulence factors used by Staphylococcus puts holes in host cells?
A. Protein A B. Alpha toxin C. Leukocidin D. Clumping factor
Lamins are a type of ____
a. myosin b. microtubules c. intermediate filaments d. microfilaments e. actin
The mesophyll layer of leaves is important to plants because
A. it keeps the plant from drying out. B. it anchors the plant to the soil. C. most of the photosynthesis occurs here. D. most of the water needed for photosynthesis is absorbed here.