Subject: Some questions about protein synthesis...

I know that there is a "start tag" on the beginning end of a strip of RNA, 
right? So what happens if the tag is missing? Might the ribosome run the 
RNA through backwards and cause a mutation?
Here's another question. If there are 64 possible triplets and only 20 
amino acids, what happens if a triplet does not correspond to an amino 
acid?
Thank you,
Spencer

Re: Some questions about protein synthesis...