n.
1.short-chain RNA molecules present in the cell (in at least 20 varieties, each variety capable of combining with a specific amino acid) that attach the correct amino acid to the protein chain that is being synthesized at the ribosome of the cell (according to directions coded in the mRNA)
Idiom of the Day
eyes in the back of one's head
the ability to know what is happening behind one`s back
The man has eyes in the back of his head and you can never borrow anything without him knowing about it.