Is "Junk" DNA Used to Provide Genetic Memory

DanielS858 daniels858 at aol.com
Tue Jul 19 16:35:02 EST 1994


In article <fiddick.768245397 at lifesci>, fiddick at lifesci.lscf.ucsb.edu
(Laurence Fiddick;x2791) writes:

>what is the purpose of junk DNA?

By junk it is meant that the DNA does not code for any proteins directly.
However, this does not mean that it is not of any use at all. All the non
sex cells in the human (or any other) body have the same genetic
information so how come a muscle cell is completely different from a nerve
cell? The answer is that only a proportion of the all the possible
proteins that could be expressed are actuallly expressed. The non coding
regions of DNA contain the elements that control the expression of the
coding regions. The non-coding regions do this by binding specific
proteins and blocking the expression of the coding regions




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