Superantigens are
A. bacterial toxins that activate T cells at a 100 times greater rate than other antigens.
B. cell markers found in some member of a species but not in other members.
C. body tissues that the immune system mistakes as foreign.
D. antigens that evoke allergic reactions.
Answer: A
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A. reciprocal translocation. B. mismatch. C. base exclusion. D. inversion. E. closed reading frame.
Eukaryotes such as animal and plants cells differ from prokaryotes in that prokaryotes rev: 10
A. lack internal compartmentalization. B. lack true DNA. C. use the cell's membrane rather than ribosomes for making proteins. D. contain numerous organelles. E. undergo sexual reproduction.
How is air contamination prevented when an inoculating loop is used to introduce or take a bacterial sample to/from an agar plate?
What will be an ideal response?
Convergent evolution may occur when __________.
a. ancestral structures are co-opted for new functions b. homologous structures are adapted for different functions c. species have similar ecological roles d. an individual species colonizes a new habitat e. species are widely separated geographically