Phospholipid Molecules, Cholesterol, Carbohydrates

Q. Which of the following statements is NOT correct about the phospholipid molecules in the plasma membrane?

1. The polar heads face outward
2. The nonpolar tails face inward
3. The polar heads are hydrophobic
4. The nonpolar tails are hydrophobic

Q. Which of the following statements best describes the chemical composition of the plasma membrane

1. Plasma membrane is composed of two layers - one layer of the Proteins and one layer of the Phospholipids
2. Plasma membrane is composed of equal number of Phospholipids, proteins and carbohydrates
3. Plasma membrane is a bilayer of proteins with associated lipids and carbohydrates
4. Plasma membrane is a phospholipid bilayer with associated protein and carbohydrates