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.
A选项：In children, the only body tissues from which telomerase is absent are those in which cells are not rapidly dividing. 在儿童身上，唯一缺少端粒酶的身体组织是那些细胞不能快速分裂的组织。
Telomerase is an enzyme that is produced only in cells that are actively dividing.(核糖体蛋白酶仅产在于旺盛分裂的细胞中)
it is generally absent from body tissues in adults(在成年的人体组织中通常缺少核糖体蛋白酶)
核糖体蛋白酶只存在于分裂旺盛的细胞(换句话说:就是分裂不旺盛的细胞一定没有该酶)
B选项,儿童体内,没有该酶的组织是细胞不快速分裂的组织
错误一:文中是成年人,而选项中是儿童;
错误二:文中说分裂不旺盛的细胞一定没有该酶（即:分裂不旺盛可以→没有酶）；选项中说的是没有该酶的组织是细胞不快速分裂的组织（即：没有该酶→细胞分裂不快速）（telomerase 只在分裂旺盛的细胞中才会产生，但不代表所有分裂旺盛的细胞中都会产生telo➡️可能有的分裂旺盛的细胞，因为其他的限制原因没有产生telo ➡️ B选项错）
错误三:文中说的是旺盛分裂(actively dividing),选项中说的是快速分裂(rapidly dividing)
C选项：The presence of telomerase in bone marrow is [no indication of] bone marrow cancer. 骨髓中端粒酶的存在[不代表]骨髓癌。
登录 或 注册 后可以参加讨论