3. During the denaturation of DNA, which of the following happens? (2 points)(A)Phosphodiester bonds break within the sugar-phosphate backbone.(B)Hydrogen bonds within the sugar-phosphate backbone break.(C)Hydrogen bonds between complementary bases break.(D)Phosphodiester bonds between complementary bases break.

6. A previously unknown cell type is discovered in the central nervous system of a laboratory strain of mice. In cell-culture experiments, researchers find that the cell type can self-renew, but can only differentiate into one cell type. Which of the following best characterizes this cell type? (2 points)(A)Unipotent embryonic stem cell(B)Unipotent somatic stem cell(C)Multipotent somatic stem cell(D)Multipotent embryonic stem cell

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