First exposure to the allergen (hapten) causes an increase in the number of:
A. Th1 cells
B. B cells
C. antibodies
D. cytotoxic T cells
Answer: A. Th1 cells
Biology & Microbiology
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During which stage of development is the egg fertilized by the sperm and the zygote undergoes cleavage?
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Steroid hormones act by
a. interacting with a target cell's DNA. b. activating mitochondria in target cells. c. acting on ribosomes for protein synthesis. d. stimulating mitosis. e. helping glucose into the target cell.
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The wavelength of light used and the numerical aperture governs ________.
A. resolution B. contrast C. magnification D. size of the field E. illumination
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