Kingella spp. can be distinguished from Neisseria spp. by its:
a. negative test for catalase.
b. positive test for lactose fermentation.
c. positive test for catalase.
d. negative test for oxidase.
A
Kingella spp. are catalase-negative, which helps separate them from Neisseria spp., with which they are sometimes confused. Kingella denitrificans may be mistaken for Neisseria gonorrhoeae when isolated from modified Thayer-Martin agar. Nitrate reduction is a key test in differentiating K. denitrificans from N. gonorrhoeae, which is nitrate-negative.
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IgM is the:
a. first antibody produced when an invading microorganism is initially encountered. b. antibody that is associated with various parasitic infections. c. antibody that is secreted in various body fluids and primarily protects those body surfaces lined with mucous membranes. d. second antibody produced when an in-vading microorganism is initially encoun-tered and the most abundant.
What is the molecular basis of familial hypercholestremia?
a. HDL enters cells using a specific receptor on the cell surface d. LDL exits cells using a specific receptor on the cell surface b. LDL enters cells using a specific receptor on the cell surface e. receptor-mediated exocytosis c. HDL exits cells using a specific receptor on the cell surface
The four nitrogen bases found in RNA are
A. adenine, thymine, guanine, and uracil. B. adenine, cytosine, guanine, and uracil. C. adenine, thymine, cytosine, and uracil. D. thymine, cytosine, guanine, and uracil. E. None of the answer choices is correct.
A tapeworm living in a person's intestine is
A. a vector. B. an internal parasite. C. a mutualistic organism. D. a predator.