People with the disease known as sickle-cell anemia are often better able to survive malaria because of
a. balanced polymorphism.
b. heterozygote advantage.
c. frequency dependent selection.
d. disruptive selection.
e. stabilizing selection.
B
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If the objective lenses of a microscope can be changed without losing focus on the specimen, they are said to be
A. optifocal. B. parfocal. C. equifocal. D. totifocal.
An animal that can maintain a constant internal body temperature regardless of environmental changes is called
a. homotherm b. cold-blooded c. an endotherm d. an ectotherm
Four of the five answers listed below are classified as white matter. Select the exception
a. myelin sheath b. descending tracts c. corpus callosum d. cerebral cortex e. ascending tract
The normal use of restriction enzymes by bacteria is to ____
a. integrate viral DNA b. cut apart short sequences of bases in DNA c. repair "sticky ends d. copy the bacterial genes e. clone DNA