okay so I'm given a graph of a melting profile of a macromolecule, it is a sigmoid "s" curve, which states that a protein is cooperative. I have four choices on what the graph will look like if it is uncooperative.

Question

1) Graph 1- straight line with + slope
2) Graph 2- horizontal line
3) Graph 3- vertical line
4) Graph 4- descending curve (less accentuated sigmoid curve.)

Help! :)