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【多选题】
人体细胞中的染色体 DNA 会随着复制次数增加而逐渐缩短。在生殖系细胞和癌细胞中存在端粒酶(由 RNA 和蛋白质形成的复合体),能够将变短的 DNA 末端重新加长。端粒酶作用机理如图所示。下列相关叙述 不正确 的是( )A.
人体生殖系细胞以外的其他细胞不含端粒酶基因
B.
端粒酶中的蛋白质能够催化染色体DNA的合成，该过程会发生碱基T-A的配对
C.
细胞衰老与染色体DNA随复制次数增加而缩短有关
D.
只有在癌细胞中存在端粒酶，因此抑制端粒酶的作用可抑制癌细胞增殖
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none
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【单选题】Cash flow to stockholders must be positive when:
A.
the dividends paid exceed the net new equity raised.
B.
the net sale of common stock exceeds the amount of dividends paid.
C.
no income is distributed but new shares of stock are sold.
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both the cash flow to assets and the cash flow to creditors are negative.
E.
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