Which Accurately Describes a Physiologic Role or Use for Iron

Which accurately describes a physiologic role or use for iron? (Select all that apply.)

A) Iron is present in every cell including both oral soft and hard tissues.
B) This nutrient is involved in the conversion of beta-carotene to protein.
C) Iron incorporates and distributes lipids within the blood.
D) Approximately 4 g (less than 1 tsp) is present in the body.
E) Lactoferrin, a salivary glycoprotein, is capable of binding iron.