Action potentials are propagated along a(n) ____.
A. sodium channel
B. axon in two directions
C. gated channel
D. axon in one direction
E. dendrite
Answer: D
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Predict the most immediate consequence of the inflammation of the pleural sac in a human.
A. Gas exchange would decrease. B. Lung volume would decrease. C. Respiratory muscle activity would decrease. D. Hemoglobin's oxygen affinity would decrease.
Deuterostomia is a ____ lineage of animals that dates to the ____
a. polyphyletic; Mesozoic b. paraphyletic; Cenozoic c. monophyletic; Paleozoic d. paraphyletic; Paleozoic e. polyphyletic; Cenozoic
A biology student is studying ground squirrels in a local park. She has captured, measured, and released many ground squirrels from an upland, rocky, wooded area, and many similar ground squirrels from a shrub area in soft soil near a stream. She is measuring skull dimensions, leg and claw lengths and shapes, and other traits of the ground squirrels from each collection area. She is involved in
A. phylogenetics. B. genetics and inheritance. C. speciation. D. All of the answer choices are correct. E. taxonomy.
In contrast to a primary immune response, immunological memory
A) generates higher antibody titers. B) provides a rapid reactivation of both cellular and humoral responses including generating higher antibody titers and antibodies with increased affinity for its antigen. C) provides a rapid reactivation of humoral responses only by generating higher antibody titers and antibodies with increased affinity for its antigen. D) provides a rapid reactivation of both cellular and humoral responses. E) generates antibodies with enhanced affinity for its antigen.