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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.
a说t是唯一一种在不分裂的细胞里没有，但是在癌细胞里有的物质。无关
b说在小孩体内唯一一种组织里没有T的是那些不快速分裂的细胞。 无关
c说在bone marrow里的癌细胞比其他成年人体内的组织里的细胞发展的要快。与t完全无关
d说在癌细胞里的t总是要比非癌细胞里的要高。 文中没有出现比较。
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