HI
To politely correct you and not to take away from your coments the
following is important.
"A string of only four amino acids (not too complicated) , i.e. DNA "
This latter statement is incorrect as DNA is primaly composed of
sequences of purines and pyrimidine bases ( not amino acids).
There are two major purines and two major pyrimidines plus a rarer few
varients of each.
It is the linear sequence of bases in triplet sub sequences which form
the genetic code . Its is the genetic code which determines the primary
structure of proteins ( ie amino acid sequence).
Hope this clarifies things for yourself and others.
I also agree the ability to form recombinat DNA in vitro is a massive
quantum leap
best N10