Date: December 2004
Is the DNA the same in every organism? Would the DNA of a
paramecium be the same as the DNA of an onion?
The chemical makeup of DNA is the same in every organism, ie. it is made
from the same basic chemicals. It is the order of the bases (ATC and G) that
form a code that makes one organism different from another. It is kind of like
our alphabet. All words in our language are made up of a grouping of the
same 26 letters. We put them in different orders and of different lengths to
make different words with different meanings. DNA is similar except that the
code is made of only four letters. Putting them in different orders and of
different lengths make new genes that code for different proteins.
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Update: June 2012