1) What is the primary structure of a phospholipid? a) A) Hydrophilic head and hydrophobic tail b) B) Hydrophobic head and hydrophilic tail c) C) Both head and tail are hydrophilic d) D) Both head and tail are hydrophobic 2) Which part of the phospholipid is hydrophobic? a) A) Head b) B) Tail c) C) Both d) D) Neither 3) What is the main function of the phospholipid bilayer? a) A) Energy storage b) B) Structural support c) C) Barrier formation d) D) Enzyme activity 4) Why do phospholipids form bilayers in water? a) A) Hydrophobic interaction b) B) Hydrophilic interaction c) C) Ionic bonding d) D) Covalent bonding 5) How do oxygen and carbon dioxide molecules move across cell membranes? a) A) Through protein channels b) B) By active transport c) C) Through the hydrophobic core d) D) They cannot move across

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