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 fight disease.
it is a complex, folded chain that 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.

The second option is the best answer.

Proteins are complex polymers of amino acids. They are folded into 3 dimensional structures . This folding defines not only the size and shape of the protein, but also its function.

The folding of a protein allows for interactions between amino acids that may be distant from each other in the primary  sequence of the protein. In enzymes, some of these amino acids form a site in the structure that catalyzes the enzymatic reaction. This site is called the active site.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek

the endomembrane system i think