Movement in a specific direction in response to a stimulus is called a ____
Fill in the blank with the appropriate word.
taxis
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Molecules that stimulate T cells to proliferate nonspecifically, causing the release of massive quantities of cytokines, which, in turn, can lead to tissue damage are called ________.
Fill in the blank(s) with the appropriate word(s).
Action potentials are propagated in a one-way direction down a neuron plasma membrane because
a. the action potential is of insufficient intensity to stimulate the voltage-gated ion channels behind it. b. the adjacent channels upstream from the action potential are ligand-gated. c. the adjacent channels upstream from the action potential are in their refractory period. d. voltage-gated ion channels are suppressed. e. the adjacent channels upstream from the action potential are at their threshold potential.
Mountain, basin, and hybrid sagebrush were each raised in the three different habitats where they are found. What is likely to happen to the hybrid zone?
a. It will disappear because the basin population will move up the mountain and replace the hybrids. b. It will disappear because the mountain population will move down the mountain and replace the hybrids. c. It will disappear because the basin population will move up and the mountain population will move down the mountain and replace the hybrids. d. It will persist because the hybrids have the highest fitness in the hybrid zone.
Adam, a once active normal three-year old boy, was experiencing increasing bouts of lethargy and began to regress developmentally. His mother scheduled an appointment with his pediatrician, who ordered a number of different blood tests. The most notable blood test result that piqued the physician's interest was a pronounced eosinophilia. Which of the following would be most likely to cause this abnormality?
A. Infection with Giardia intestinalis B. Infection with a parasitic helminth C. Infection with Cryptosporidium spp.? D. Malaria E. Viral infection