When mRNA is translated, it is done differently in
Eukaryotic cells and Prokaryotic cells. In Eukaryotic cells, the mRNA
itself moves down the chain when the first tRNA is released, where as in
Prokaryotic cells, the ribosome moves when the first tRNA is
released. Why is that?
there is no difference between the two. Since neither the ribosome nor
the mRNA is attached to anything in the cell, you can either think of the
mRNA moving through the ribosome, or the ribosome moving down the mRNA.
Either way, it's the same thing.
Paul Mahoney, PhD
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Update: June 2012