The outcome of the Gram stain is based on differences in the ________.
A. flagella
B. ribosomes
C. cell wall
D. cell membrane
Answer: C
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The most common circulating antibody, comprising about 80% of the serum immunoglobin, is
A) IgA. B) IgC. C) IgD. D) IgG.
Which of the following is a bone of the lower
leg in humans?
a. femur b. fibula c. radius d. ulna e. humerus
An interaction between two species in which both species benefit is known as ____
a. mutualism b. parasitism c. commensalism d. competition e. predation
Two proteins, Rag-1 and Rag-2, catalyze VDJ recombination. What is the likely outcome of a deletion of the Rag genes?
A. Mild susceptibility to infection due to T cell defects B. Severe combined immunodeficiency (SCID) of both B and T cells C. Increased antibody diversity from B cells D. Increased resistance to infection due to enhanced B and T cell function