Parallel evolution involves
A. any two organisms with the same trait.
B. two organisms sharing the same trait because they have a common ancestor with that trait.
C. two lineages acquiring the same trait independently without the trait being present in a common ancestor.
D. possession of homologous structures.
E. All of the choices are part of parallel evolution.
Ans: D. possession of homologous structures.
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Where is the trp repressor gene located?
a. just upstream of the trp operon b. on a region of the chromosome distant from the trp operon c. adjacent to the lac repressor gene d. just downstream of the trp operon e. directly adjacent to the promoter region of the trp operon
The class of an antibody is determined by the structure of its
a) antigen-binding site b) constant region c) variable region
The total (gross) number of ATPs produced from glycolysis is estimated to be
A. thirty-six. B. thirty-four. C. two. D. four.
All of the following bacteria are part of the normal flora EXCEPT:
A. Salmonella spp. B. Bacteroids spp. C. Lactobacillus spp. D. Staphylococcus spp. E. Viridans streptococci