Explain what has to happen to embryonic stem cells from a donor before they are used in a patient as a therapy.
What will be an ideal response?
The embryonic stem cells have to be genetically engineered to match the patient's immune system. The stem cells' self-recognition genes are replaced with the patient's self-recognition genes.
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Legumes grown in sterile soil would be expected to have ____
a. purplish veins b. chlorosis and mottled or bronzed leaves c. chlorosis in older leaves and stunted growth d. burned leaf edges and curled, mottled, or spotted older leaves e. pale green, rolled, or cupped leaves
Fossils from Ethiopia indicate that modern humans had evolved by ________ years ago
a. 15,000 b. 85,000 c. 195,000 d. 950,000 e. 1.2 million
Which of the following is NOT true of
placozoans?
a. They have a flattened body. b. They have ciliated cells and gland cells. c. They eat bacteria and single-celled algae. d. They have four types of cells. e. None of these are true of placozoans
Which of the following does not contribute to the evidence for the out-of-Africa hypothesis?
a. the gradual divergence of Homo sapiens in different locations b. the rapid replacement of Homo sapiens approximately 100,000 years ago c. coalescence d. the existence of greater mitochondrial diversity in Africa e. the interbreeding of humans and Neanderthals