Based on the fluid mosaic model of cell membranes, which of the following statements about membrane phospholipids is true? They frequently leave the bilayer and dissolve in the surrounding solution.
The hydrophilic regions of phospholipids are exposed to the cytosol and extracellular environment.
They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane.
They frequently flip-flop from one side of the membrane to the other.

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.