In most people, the mucus lining the nose and lungs would be considered
____________________.
a. an adaptive response against pathogens
b. a physical barrier to reduce infections
c. an innate mechanism
d. both a physical barrier to reduce infections and an innate mechanism
D
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Calcium levels are primarily under the control of
a. calcitonin and thyroxine. b. parathyroid hormone and calcitonin. c. prolactin and oxytocin. d. parathyroid hormone and thyroxine. e. progesterone and ADH.
Cross-breeding produced featherless chickens for
which of the following purposes? a. to make it easier to process after slaughter b. to prevent a feather infecting disease c. to be more resistant to high temperatures in the desert d. to improve breeding efficiency e. to do all of these
A mutation that involves one or a few nucleotides is called
a. A mutagen b. An inversion c. A point mutation d. A translocation
MHC class II cell surface proteins are found on what cells?
A. Erythrocytes only B. Macrophages, B cells, and dendritic cells C. Natural killer cells only D. Neutrophils only E. Neutrophils and natural killer cells