Class II MHC molecules are found primarily on
A. macrophages.
B. dendritic cells.
C. erythrocytes.
D. T cytotoxic cells.
E. macrophages AND dendritic cells.
E
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Imagine that you are a farmer who chose not to rotate your crops with soybeans even though the local
extension agent recommended that you do so. Which deficiency symptom in your crops should indicate to you that the extension agent's advice was correct?
a. chlorosis and mottled or bronzed leaves b. burned leaf edges and curled, mottled, or spotted older leaves c. purplish veins d. pale green, rolled, or cupped leaves e. chlorosis in older leaves and stunted growth
Which factor has the least effect on the amount of incoming light that strikes an area?
a. latitude b. temperature c. particulate matter in the atmosphere d. total surface area that sunlight strikes e. Earth's tilt
How does termination of translation take place?
A) The end of the mRNA molecule is reached. B) A stop codon is reached. C) The cap is reached. D) The poly-A tail is reached.
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.