The Casparian strip is associated with the
a. epidermis.
b. vascular tissue.
c. cortex.
d. root hairs.
e. endodermis.
Answer: e
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Proteins are three dimensional molecules made of strands of amino acids (imagine a ball of string). There are 20 different amino acids used in proteins found in living organisms. Some of these amino acids are polar and others are non-polar. Where would a series of non-polar amino acids most likely be located in a protein that is found in the cytosol of an animal cell?
A. On the surface of the protein B. In the interior of the protein C. At the very top of the protein D. At the very bottom of the protein
Photosynthetic protists are informally referred to as:
A. protozoa. B. plants. C. fungi. D. algae.
What is the significance of the production of above-ground coralloid roots by cycads that have underground stems?
A. The roots grow in waterlogged soil and they need to protrude into the air in order to respire. B. The branching of coralloid roots provides greater surface area for absorption of water. C. It keeps roots above the ground where they cannot be attacked by parasitic nematodes. D. The roots have mutualistic photosynthetic cyanobacteria that fix nitrogen for the cycad and the cyanobacteria can only survive if they are above ground where they are exposed to light. E. The soil in which cycads live has a low pH that would kill the roots if they were completely below ground.
a person who has been exposed to rabies receives both HRIG (human rabies immunoglobulin) injected near the bite site and the rabies vaccine. What does this strategy represent?
A. active immunization B. passive immunotherapy C. viral hemagglutination inhibition D. passive immunotherapy combined with viral hemagglutination inhibition E. active immunization combined with passive immunotherapy