a folded chain of amino acids a folded chain of carbohydrates a branched chain of fatty acids a branched chain of nucleic acids
I gave my students this multiple choice question: Which of these is part of the description of protein?

Only one answer is correct among these 4 choices:
- a folded chain of amino acids
- a folded chain of carbohydrates
- a branched chain of fatty acids
- a branched chain of nucleic acids

Could you tell me which one is correct?

a folded chain of amino acids