Which of the following statements about the smooth endoplasmic reticulum is/are correct?

liver cells are abundant in ser.
the testes and ovaries are tissue types whose cells are abundant in ser.
the ser is the primary location for synthesis of membrane-bound proteins.
cholesterol is made in the ser.
the luminal face of the ser is the main site at which membrane lipids are synthesized.
phospholipids are synthesized from cytosolic water soluble precursor molecules.
flippases are the enzymes that allow lateral movement of a lipid within a leaflet.