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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.
T是一种只存在于不断分裂的细胞中的酶，所以T一般不会出现在成年人体内。但是BM和cancer细胞都是特例，因为它们都在人体内不停的分裂。问must be true
choice c, 骨髓细胞中出现Telomerase 并不表明已患上骨髓癌. correct,因为出现在骨髓细胞中的Telomerase有两个可能的来源：1. 癌细胞分裂 2.骨髓细胞本身分裂
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