A group is considered polyphyletic if
A. all members share homoplastic traits.
B. the group does not contain the most recent common ancestor.
C. it is the most parsimonious grouping.
D. not all descendants of the common ancestor are included.
E. all members of the group share a common ancestor.
Answer: B
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Diagnosis of candidiasis is difficult because
A. this fungus is a frequent secondary invader in other disease processes. B. no immunologic procedures for the identification of Candida currently exist. C. a mixed microbiota is most often found in the diseased tissue. D. All of the choices are correct.
The sodium-potassium pump maintains a high sodium ion concentration in the cell.
a. true b. false
Last summer a bee stung you for the first time. You developed only a small area of redness and swelling at the site. However, if you are stung again and have a severe reaction that occurs more rapidly, you know that this is due to the activation of
A) memory cells. B) complement. C) cytotoxic T cells. D) helper T cells. E) tissue macrophages.
Which is NOT a disease caused by a parasitic helminth?
a. leishmaniasis b. onchocerciasis c. schistosomiasis d. trichinosis