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
keep time
to keep track of the time in a game or athletic contest
I kept time during the football game at our high school.