Final answer:
An integral membrane protein is an example of an amphipathic molecule because it contains both hydrophilic and hydrophobic regions, allowing it to interact with both the water-soluble and lipid parts of cell membranes.
Step-by-step explanation:
An amphipathic molecule is a molecule that has both polar (hydrophilic) and nonpolar (hydrophobic) regions. Among the options provided, an integral membrane protein is an example of an amphipathic molecule because it has regions that can interact with both the hydrophobic interior of the lipid bilayer and the hydrophilic exterior environment. Integral proteins span the entire membrane, with hydrophilic domains exposed to the surrounding water-based environment and hydrophobic domains that interact with the fatty acid chains within the membrane.