Proteins embedded in cellular membranes are essential to cellular function. Which of the following statements correctly describes the property that allows these specific proteins to be found in the membrane?\ \ A.\ The surface region of the protein exposed to the extracellular space is hydrophobic.\ \ B.\ The surface region of the protein exposed to the membrane is mostly hydrophobic.\ \ C.\ The surface region of the protein exposed to the interior of the cell is hydrophobic.\ \ D.\ The surface region of the protein exposed to the membrane is mostly hydrophillic.