Which of the following diseases is NOT a streptococcal disease?
A) Rheumatic fever.
B) Whooping cough.
C) Scarlet fever.
D) Strep throat.
E) Necrotizing fasciitis.
Ans: B) Whooping cough.
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In QTL mapping, the parental strains are crossed and the F1 generation backcrossed to which of the following?
A. The F2 generation B. The parental generation C. A strain that is homozygous recessive for all markers D. A wild-type organism
Which type of crossover event produces no recombinant chromosomes?
A) single-strand crossover B) two-strand double crossover C) three-strand double crossover D) four-strand double crossover E) None of the above; all crossover events produce recombinant chromosomes.
What cytokine stimulates plasma cells to secrete IgA?
A) interleukin-5 B) interleukin-10 C) interleukin-4 D) interferon-gamma E) interferon-alpha
Which of the following traits is unique to arthropods?
a. Appendages b. Segmentation c. A ventral nerve cord d. A dorsal anterior brain e. An exoskeleton