Genetic engineering can be used to
produce chemicals and hormones that
the body requires. For an example
we'll use insulin for a diabetic
person. First remove a certain gene
from a human cell using a restriction
enzyme, in this instance we'll "cut"
out the gene for producing insulin.
Second extract a plasmid from a bacterial
cell and again "cut" it with the
restriction enzyme. Insert the gene into
the plasmid by attaching both of the
"sticky ends" of the gene onto the ends
of the plasmid. Now re-insert the hybrid
plasmid into the bacteria cell, where it
will replicate to make new DNA for the cell.
Many more daughter cells can be cultured
and used to make insulin.
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