The letter “A” in the above figure represents
a. keratin-filled, dead epithelial cells.
b. replicating epithelium.
c. mucus produced by underlying ciliated cells.
d. white blood cells attacking a bacterial cell.
e. all of these.
Answer: a
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The complement system is a group of ____
a. vaccines b. defense proteins c. antibodies d. antibiotics e. lymphocytes
An F? donor includes F DNA plus a segment of bacterial chromosome DNA. If conjugation is interrupted before the entire F? chromosome transfers, what could be the expected consequences?
A) integration of some but not all F? genes into the recipient's chromosome B) a smaller F? plasmid than had been present in the donor C) failure of the F? strand to circularize in the recipient D) change of the recipient from F– to F+ E) formation of a recipient that is a stable partial diploid
A population in ecology is defined as ________
A) a group of organisms, all from the same species B) a group of organisms, some from the same species, some from other species C) a group of organisms, some from the same species, some from other species, and their surrounding environment D) one organism and its surrounding environment
Although this bacteria is typically found in soil and water, burn wound patients are susceptible to ___infection.
A) E. coli O157:H7 B) Bordetella pertussis C) Pseudomonas D) Shigella E) Yersinia pestis