What determines the cell type that a given CD4+ TH0 cell will differentiate into?
A. Specific antibody exposure
B. Antigen exposure
C. Type of cytokine exposure
D. Hormones
Answer: C
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Most meteors come from comets, but most meteorites come from asteroids. Explain this statement
What will be an ideal response?
The most frequently used portal of entry for pathogens is the
A) mucous membranes of the respiratory tract. B) mucous membranes of the gastrointestinal tract. C) skin. D) parenteral route. E) All of these portals are used equally.
Predict what would happen if transport between the Golgi apparatus and a growing hyphal tip in a fungus was interrupted.
A. extension of the hyphal tip would be discontinued B. transport by vesicles of cell-wall materials would be blocked C. uptake of water by osmosis would not occur D. transport by vesicles of enzymes would cease E. All of the answers are correct.
Which of the following statements is true of protein hormones?
a. They can pass through the cell membrane. b. They can be taken orally. c. They can be absorbed across the small intestine.