Among the variety of virulence factors possessed by pathogenic enteric bacteria, which ones allow them to evade the immune surveillance of its host?
What will be an ideal response?
Most enteric bacteria have capsules which make them resistant to phagocytosis.
Most also possess a type III secretion system, which is a complex structure composed of 20 different polypeptides. Once assembled, the system spans the two membranes and peptidoglycan of the bacterial cell and inserts into the host's cytoplasmic membrane. This forms a channel through which bacterial proteins are introduced into the host cell. Because the bacteria synthesize type III systems only after they have contact with a host cell, the type III proteins are never exposed to leukocytes. This also helps these bacteria evade immune surveillance.
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The approximate resolving power of the unaided human eye is:
A) 0.2 cm. B) 0.2 mm. C) 0.2 ?m. D) 0.2 nm.
Which information is most useful?
What will be an ideal response?
In adult vertebrates, which of these is not one of the four principal kinds of primary tissues?
A. connective B. muscle C. nerve D. epithelial E. supportive
In humans, which genetic mechanism led to the formation of the X and Y chromosomes?
A. Translocation B. Nondisjunction C. Inversion D. Reduced crossing over E. Insertion