Which of the following choices best describes the genetic engineering used to prevent rejection of xenotransplants?
1.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig.
2.Hyperacute rejection of MHC proteins from animal donors is prevented by the use of cloned animal tissues lacking MHC markers.
3.Transgenic pigs carrying human genes donate organs to patients who also receive bone marrow transplants from the donor pig, resulting in chimeric immune systems.
4.A bone marrow transplant from the human patient to the donor pig affects MHC proteins on the pig organs, reducing the severity of xenotransplant rejection.
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The condition ____________________ can occur when an Rh- woman becomes pregnant by an Rh+ man. Fill in the blank(s) with the appropriate word(s)
X-ray diffraction studies are used to determine the:a
sequence of amino acids in protein molecules. b. sequence of nucleotides in nucleic acid molecules. c. distances between atoms of molecules. d. identity of an unknown chemical. e. wavelength of X-rays.
Mosses produce sperm during the _______ stage.
A. gametophyte B. flowering C. sporophyte D. cone-bearing
What is the tropism that describes the movement of a plant towards light?
A. negative gravitropism B. positive gravitropism C. positive phototropism D. negative phototropism E. thigmotropism