The majority of the nonrepetitive genes in an organism are found in which of the following?
A. Unique sequences
B. Moderately repetitive sequences
C. Highly repetitive sequences
D. None of the answers are correct
A
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Members of the family Enterobacteriaceae
A. include E. coli, Enterobacter, Salmonella, and Shigella. B. include many medically relevant bacteria. C. primarily reside in the intestinal tract of humans and animals. D. are facultative anaerobes. E. All of the choices are correct.
In the vertebrate eye, what structure is light focused onto?
A. pupil B. lens C. retina D. sclera E. iris
Which of the following terms describes the measure of members of a single species in a habitat against all organisms within the same area?
a. community diversity b. absolute species abundance c. relative species abundance d. community richness
Until renamed by Paul Ehrlich in the 1890s, the heat-labile, nonspecific part of the immune system that enhances inflammation was known as "alexin". We now know that various proteins of this system attract neutrophils to tissues, direct phagocytosis of targets by neutrophils and macrophages, burst pathogens by insertion of the membrane attack complex (MAC), stimulate histamine release, and increase capillary permeability. What did Ehrlich rename this part of the immune system?
A. complement B. contingent C. Toll-like response D. acquired immunity E. MBL