Can someone give me examples of denatured proteins that can be brought back to native state (renatured)?

Nucleic Acids migrate from (-) to (+) on agarose electrophoresis gels because ---.

Mild, non-ionic detergents (like Triton X-100, with polar but uncharged regions that do not denature proteins) would be required for separation of which of the following proteins from cell membranes? monolayer-associated proteins lipid-linked proteins transmembrane proteins integral proteins peripheral proteins

Please help me with this question. More than one answer may be correct.  Elastin _______. Options: A)  has a repeating structure of 3 amino acids such as Gly-Pro-X B)  crosslinks with numerous other elastin peptides to make an elastic fiber C)  is physically attached to the smooth endoplasmic reticulum D)  is physically attached to ribosomes E)  is rich in hydrophobic residues