What is the immune function of the placenta in human and marsupial embryo development?
What will be an ideal response?
Since the placenta prevents fetal blood from entering the maternal bloodstream, the mother's immune
system does not sense the presence of a foreign substance in the body. In marsupials, such as the
kangaroo, there is no placenta so the fetus is expelled from the mother's body before development is
complete. The young kangaroo then must complete his development in an external pouch.
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The initial carrying capacity of an environment
is indicated by a. A. b. B. c. C. d. D. e. E.
Four of the five elements listed below are elements
whose symptoms of deficiency include chlorosis. Select the exception. a. phosphorus b. iron c. chlorine d. copper e. magnesium
The letter âFâ from the above figure represents
a. complement. b. MHC markers with antigen expressed to the surface of a cell. c. lysosome fusing with a phagosome. d. plasma membranes fusing. e. MHC recycling.
The ability of a microbial cell to produce beta-lactamases is based on _______.
A. other organisms B. its environment C. the temperature D. its genetics