The biological species concept by Ernst Mayr defines a species in the textbook as a group of interbreeding natural populations reproductively isolated from other such groups. However, such a definition cannot be used for
A. fossils.
B. asexual organisms.
C. determining species based on dead or preserved specimens.
D. organisms that cannot be raised in captivity, easily bred, or with very long generation times.
E. All of the situations pose problems for the biological species concept.
Ans: E. All of the situations pose problems for the biological species concept.
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Which of the following antigen types found in gram-negative enterics is mismatched?
A. K antigen - capsule B. O antigen - cell wall C. H antigen - flagellar D. All of the choices are correct matches.
Human insulin, which does not provoke allergic reac-tions, has been produced by transgenic E. coli since ____
a. 1952 b. 1962 c. 1972 d. 1982 e. 1992
Which of the following is NOT a known dysfunction
in the expression of sickle-cell anemia? a. impaired brain function b. rheumatism c. heart failure d. excessive absorption of oxygen causing the cell to swell e. enlarged spleen
Exotoxins are
A) secreted and only made by Gram-positive bacteria. B) secreted and the targets of some childhood vaccines. C) secreted. D) only made by Gram-positive bacteria. E) the targets of some childhood vaccines.