Phospholipids and cholesterol form a ______, occur ______ in water, and hydrophobic interactions involve the ______ of the phospholipids.

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Multiple Choice

Phospholipids and cholesterol form a ______, occur ______ in water, and hydrophobic interactions involve the ______ of the phospholipids.

Phospholipids are amphipathic, with hydrophilic heads and hydrophobic tails. In water, they spontaneously assemble into a bilayer: the hydrophobic tails hide from water in the interior, while the hydrophilic heads face the aqueous environment on each side. This creates a fluid, dynamic membrane rather than a rigid structure. Cholesterol sits within this bilayer and helps tune its properties, but the stabilizing hydrophobic interactions come from the tails, not the heads or any proteins. The description that matches a fluid bilayer formed spontaneously in water and that hydrophobic interactions involve the tails is the best choice.

Phospholipids are amphipathic, with hydrophilic heads and hydrophobic tails. In water, they spontaneously assemble into a bilayer: the hydrophobic tails hide from water in the interior, while the hydrophilic heads face the aqueous environment on each side. This creates a fluid, dynamic membrane rather than a rigid structure. Cholesterol sits within this bilayer and helps tune its properties, but the stabilizing hydrophobic interactions come from the tails, not the heads or any proteins. The description that matches a fluid bilayer formed spontaneously in water and that hydrophobic interactions involve the tails is the best choice.

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