Which of the following models of speciation hinges on a physical barrier which prevents gene flow between populations?
A) dispersive allopatric
B) dispersive sympatric
C) vicariant allopatric
D) vicariant sympatric
E) Both A and C.
E
Biology & Microbiology
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A colorless substrate acted on by the enzyme portion of the ligand to produce a colored product is known as a/an ________.
A. antibody B. serotype C. chromogen D. antigen
Biology & Microbiology
A population of organisms that is reproductively isolated from other populations is considered a:
a. kingdom. b. phylum. c. genus. d. species. e. class.
Biology & Microbiology
Which of the following is not one of the basic types of animal tissue?
1.epithelial 2.connective 3.muscle 4.vascular
Biology & Microbiology
When a B cell binds to its specific antigen, it undergoes ________ to produce antibodies to the antigen
a. reproduction b. clonal expansion c. clonal anergy d. differentiation
Biology & Microbiology