Answer:
changes, modifies
Example:
we'll use ATG
go through transcription
we have UAC now
now we have a missense mutation
we'll do GAC
see how we changed the U to a G?
This change also changed the amino acid
before, for UAC we had Tyrosine
Now, for GAC we have Asp acid
IF we had no change in the amino acid, it would be a silent mutation, but since we did it is a missense mutation.
hope that helped :)