扫描二维码，直接登录
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.
原文描述的是:虽然T在成人中缺乏，但是在BM中有，因为BM也一直在分裂。然后又说cancer虽然一直也在分裂，但是并不是因为有T，它是一个例外。我想c选项其实表述的意思就是telomerase和cancer没关系，也就加强了原文中的cancer 是例外的意思。
登录 或 注册 后可以参加讨论