Concept 26 RNA was the first genetic molecule.
![factoid](/images/general/factoid.gif)
![Did you know ?](/images/general/didyouknow.jpg)
Amino acids and other organic molecules have spatial orientations. Some molecules are mirror images of each other and these are known as L- and D-forms.
![Hmmm...](/images/general/hmmm.jpg)
All the amino acids used by living organisms on earth are in the L-form. Why?