The use of cell-based models to understand or treat human disease processes is aided by stem cells in all the following ways,except:
A)growth of neurons in cell culture containing mutations associated with ALS for drug screening. B)culture of patient-specific cells to replace those lost to disease,such as for type 2 diabetes. C)differentiation of neurons from iPS cells to replace those damaged by neurodegenerative diseases. D)provides proof that ES cells are pluripotent and can divide to make a normal animal.
The first differentiation event following fertilization occurs when:
A)the morula separates from the blastocyst. B)the trophoectoderm separates from the inner cell mass. C)the four-cell stage undergoes cleavage to generate the eight-cell stage. D)the zygote divides to form two cells.