mRNA is like a waitress. It has gone the DNA-in this case, it's kinda like a customer-, written down what kind of amino acid it needs, and brings it to the ribosome.
rRNA is like a translator. It translates the amino acid into the language of proteins. It's the same recipe, but a different language.
tRNA is like the French chef. He hears what amino acid is needed from the rRNA and puts the sequence together.
Hope this helps!
Source(s): Former biology student