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题库 / GMATLA-CR-8
Telomerase is an enzyme that is produced only in cells that are actively dividing. For this reason it is generally absent from body tissues in adults. Bone marrow is an exception to this rule, however, since even in adults, bone marrow cells continually divide to replace old blood cells. Cancers are another exception, because their cells are rapidly dividing.
The information provided most strongly supports which of the following?
Telomerase is the only enzyme that is present in cancerous cells but absent from cells that are not actively dividing.
In children, the only body tissues from which telomerase is absent are those in which cells are not rapidly dividing.
The presence of telomerase in bone marrow is no indication of bone marrow cancer.
Cancer of the bone marrow develops more rapidly than cancer growing in any other kind of adult tissue.
The level of telomerase production is always higher in cancerous tissue than in noncancerous tissue.
D 极端情况，癌细胞就长在骨组织处所以增长更快，按题干的说法本来就该快
E 癌细胞和正在分裂的细胞相比就不一定谁多了
不知道这样理解对不对，D的话，文中没有提及，T这种酶是在分裂细胞中会产生，但貌似并没有说因为骨髓中本来就有这种酶，骨髓癌变会比其他癌变更快。癌变速度和T酶到底是果因关系还是因果关系，原文没有提及？只知道相关。
E的话，我是这样理解的，不知道对不对，如果是小孩子的正常tissue中的T酶含量和癌变细胞的T酶含量，到底谁高？原文也没交代？
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