for his work on ribonucleaseandfor their contribution to the understanding of the connection between chemical structure and catalytic activity of the ribonuclease molecule
for their elucidation of the enzymatic mechanism underlying the synthesis of adenosine triphosphateandfor his discovery of an ion-transporting enzyme, Na+, K+ -ATPase
... bacteria.
Plants, unlike animals, do not get food by eating other organisms (as always in nature, there are exceptions: carnivorous plants such the Venus fly trap). ...