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 rapaidly dividing.
A. Telomerase is the only enzyme that is present in cancerous cells but
absent from cells that are not activly dividing.
B. in children, the only body tissues from which telomerase is absent are
those ins which cells are not rapidly dividing.
C. The presence of telomerase in bon marrow is no indication of bone marrow
cancer.
D. Cancer of the bone marrow develops more rapidly than cancer growing in any
other kind of adult tissue.
E. The level of telomerase production is always higher in cancerous tissue
than in noncancerous tissue.
the information provided most strongly supports which if the following?
the answer is C
不懂....?
why not E?
題目說的不是 Telomerase 只存在於分裂活躍的細胞中
因為這個原因 所以很少產生在成人體內
但是bone marrow 與 Cancer 是例外
存在於bone marrow 是因為bone marrow cell 不斷分裂以替代老的紅血球細胞
cancer 是因為他們的細胞快速在分裂
所以 C ?...
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