Question

What does it mean when scientists say that living organisms share a universal genetic code?

Answer 1

It means that they all share DNA and the 4 bases Adenine Thymine Cytosine Guanine and use the same system of cell production. (Smaller answer. Not too sure, though! ^_^

Answer 2

When scientists say they share a universal genetic code it means that all organisms it can mean either DNA as the main source of hereditary information in all life forms we know of  or more likely that all organisms we know of use a three base pair code for the synthesis of proteins, DNA produces mRNA. This mRNA is read three base pairs at a time by a ribosome and this is called the genetic code.

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