Select the pathway that would lead to the activation of cytotoxic T cells
A) B cell contact antigen ? helper T cell is activated ? clonal selection occurs
B) body cell becomes infected with a virus ? new viral proteins appear ? class I MHC molecule-antigen complex displayed on cell surface
C) complement is secreted ? B cell contacts antigen ? helper T cell activated ? cytokines released
D) cytotoxic T cells ? class II MHC molecule-antigen complex displayed ? cytokines released ? cell lysis
B
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Which of the following species is NOT
threatened or endangered?
a. ivory-billed woodpecker b. Western prairie orchid c. Texas blind salamander d. red imported fire ants e. all of these species are threatened or endangered
Which of the following is transmission of disease from mother to fetus?
A. Direct B. Fomites C. Droplets D. Vertical E. Vector
Which of the following conditions is required for the continued movement of water from the soil into and through a plant via transpiration?
A) ?atm < ?root < ?leaf < ?soil B) ?atm < ?leaf < ?root < ?soil C) ?soil < ?root < ?leaf < ?atm D) ?soil < ?atm < ?root < ?leaf
Innate immunity is more likely to play a role in defending the body against which of the following invaders?
A. measles B. chicken pox C. small pox virus D. microbial pathogens