Which statement best describes the molecular structure of protein, along with one of the functions of...

Which statement best describes the molecular structure of protein, along with one of the functions of proteins?
It is a straight chain hydrocarbon that can help fight disease.
It is a complex, folded chain that helps regulate cell processes.
It is a simple carbon, hydrogen, and oxygen molecule that creates movement.
It is a chain of nucleotides, and forms muscle, bone, and ligaments.