s777 wrote:Telomerase is an enzyme that is produced only in cells that are actively dividing. Thus, as a rule, it is not present in adult tissue. 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.

Telomerase - Found only in cells actively involved in dividing , Absent in Adult cells since they are not directly involved in division..

Exceptions - Bone Marrow & Cancer Cells.

The information provided most strongly supports which of the following?

A)Telomerase is the only enzyme that is present in cancerous cells but absent from cells that are not actively dividing.

We do not have sufficent information to claim the absence of other enzymes in Cancer cells.

B)Embryonic tissue is less likely to become cancerous than tissue that has ceased to actively divide.

We do not have sufficient information in the passage to claim the same..

C)The presence of telomerase in bone marrow is no indication of bone marrow cancer.

The passage mentions two exceptions -

1. Bone Marrow

2. Cancer cells

Now from the information we already know that telomerase enzyme will be present in Adult bone marrow of all adults hence we can't confirm Bone Marrow Cancer.

However we can not rule out the possiblity that Bone Marrow cancer doesn't occur and if it occurs telomerase enzyme will not be present .

So presence of telomerase enzyme in Bone Barrow is not an indication of Bone Barrow Cancer.

This option looks good..

D)Cancer of the bone marrow develops more rapidly than cancer growing in any other kind of adult tissue.

We do not have sufficient information in the passage to claim the same...


E)The level of telomerase production is always higher in cancerous tissue than in non cancerous tissue.

We do not have sufficient information in the passage to claim the same...

Hence IMO (C) is the best...


PS : Plz use Spoilers for the OA..