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标题: 求助涛涛gwd--2套--21题 [打印本页]

作者: volleyball 时间: 2006-7-27 13:50
标题: 求助涛涛gwd--2套--21题

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.

the answer is C, i have no idea about it.

NEED HELP

作者: gonghao 时间: 2006-7-27 14:20

T是一种酶只在持续分裂的细胞里产生。所以成人的组织是没有T的。但是骨髓是个例外，因为其持续分裂来代替旧的红细胞。癌症是另一个例外，因为其也是快速分裂的。

问：上述信息支持下列哪个选项

A：T是癌症细胞里唯一表达出来的细胞。错。文章只说T在癌症细胞里有，但不是唯一的。

B: 错，只要是分裂都有T。并非快速分裂才有。

C： T在骨髓里出现不是骨髓癌症的指征。正确的。因为骨髓本身也会分裂，会有T。癌症不一定要存在。

D：没有提到

E：没有提到

作者: volleyball 时间: 2006-7-29 13:57

thanks a million

作者: lly1972823 时间: 2006-8-6 20:20

many thanks !!!!

作者: maydaythekid 时间: 2006-8-12 14:45

归纳题，紧扣原文的因素，不做推理

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