What is the major defense mechanism employed against virus infections?
A. Autoimmunity
B. Allergies
C. Antibody-mediated Destruction
D. Phagocytosis
E. Cell-mediated Immunity
Ans: E. Cell-mediated Immunity
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If you want a plant to grow very large, which hormones might you want to treat it with? Check all that apply.
_____ Abscisic acid. _____ Gibberellins. _____ Brassinosteriods. _____ Cytokinins.
If bacteria are infected with a bacteriophage and briefly exposed to radioactive uracil, what results would you expect to see immediately after exposure?
A) radioactive mRNA in the cytoplasm B) radioactive mRNA in the nucleus C) radioactive DNA in the cytoplasm D) radioactive DNA in the nucleus E) radioactive proteins in the nuclear membrane
Saber teeth found in different groups of extinct carnivorous mammals are considered ________ structures, as the fossil record shows that saber teeth evolved independently among the groups.
Fill in the blank(s) with the appropriate word(s).
An axenic culture is one which
A. is obtained from a clinical sample. B. is grown as a broth culture. C. contains only a pure culture. D. contains mixed microbiota. E. contains only pathogens.