The proteins that must be matched as closely as possible between an organ donor and a recipient are the ________ proteins
A) clotting factor B) antibody C) cytokine D) MHC
D
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A striking feature of Clostridium tetani that differentiates it from other pathogenic species of Clostridium is its ability to
A. produce a greenish pigment. B. form spores. C. form terminally located, spherical spores. D. grow aerobically
Amoebozoans are heterotrophic protists with cells that lack ____; therefore, they can constantly change shape
a. cell junctions b. a cytoskeleton c. a cell membrane d. a cell wall or pellicle e. pseudopods
Which best describes a result of sexual reproduction?
a. The only source of variation is mutation. b. Clones of the original cell are produced. c. One cell divides to produce two identical cells. d. Two sex cells combine to form a fertilized cell. e. The offspring obtain genes only from one parent
If you wash your skin and hair several times a day, you will soon have dry skin that easily cracks and bleeds because the oils you have removed are necessary to keep the skin supple. This oil is
A. salty sweat secreted by sweat glands. B. lymph secreted by lymphatic ducts. C. pili secreted by arrectors. D. sebum secreted by sebaceous glands. E. sebum secreted by sweat glands.