You are presented with the quiz "are used to repair cells by the human body" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "protein is used to repair cells by the human body" and "biomolecules, such as proteins, are composed of one or many chains folded into compact forms". 

So, what's the best answer to the question?


 

  Biomolecules         