In phloem, bulk flow occurs from regions of high to low ________ concentration.
A. solute
B. mineral
C. water
D. cytoplasm
E. cytosol
Answer: A
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A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
A) legs B) no jaws C) an amniotic egg D) endothermy
An outbreak of severe diarrhea occurs in an intensive care wing of a major hospital. As a result, the patients are all screened for colonization and infection by the pathogenic organism. However, not all of the patients identified carrying the organism by phenotypic identification and characte-rization are displaying symptoms of infection. The reason for this discrepancy is:
a. some patients have a stronger immunity to the pathogenic organism. b. the patients who are not displaying symp-toms have been on antibiotics and the or-ganism has mutated and is no longer pa-thogenic. c. the patients are not all infected with the same strain of the organism that is carrying the enteric toxin causing the diarrhea. d. the laboratory has likely misidentified the organisms.
You go scuba diving and bring back to the lab an animal that has bilateral symmetry, a true coelom, and is a deuterostome. What animal could this be?
A. jellyfish B. sea cucumber C. octopus D. snail E. rotifer
Complement activation results in ALL of the following EXCEPT
a. membrane lysis. b. antibody production. c. lysis of target cell. d. enhanced phagocytosis.