What have we learned about RNA structure and function so far? Although RNA is a single-stranded molecule ... Prokaryotic organisms contain one type of rRNA gene that encodes three distinct ...

(C) The subregions of a glycerophospholipid molecule; phosphatidylcholine is shown as an example. The hydrophilic head is composed of a choline structure ... carbon atoms in one of the hydrocarbon ...

Scientists still needed to figure out this molecule's structure ... just like the one before. This way DNA can reproduce itself without changing its structure -- except for occasional errors ...