You are presented with the question "What lacks regions that do not code for proteins?" and the following answer choices: 
- prokaryotes
 - human cells
 - peachleaf willow
 - graptolites
 - barnacles
 - plant cells
 - eukaryotes
 - gastropod shells

Now knowing that introns are regions that do not code for proteins and prokaryotes lack introns, whereas eukaryotes contain introns, choose the best answer.


 

 prokaryotes        