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atom replacement in DNA

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#1 BobMilan



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Posted 07 November 2013 - 12:07 PM

I have read that 98% of the atoms in human cells are replaced every year. Are the atoms in DNA replaced?

#2 bob1


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Posted 08 November 2013 - 03:23 PM

Where did you read that?  There is certainly turn-over of many of the proteins in the cell, but most terminally differentiated cells are not dividing, and so the are really only metabolically active, so there is little turn-over of much of the proteins in the cell.  The DNA is not replaced unless it needs to be repaired, or copied for replication.

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