Question

often described by the fluid - mosaic model. this model explains how the membrane is composed of a phospholipid bilayer, with various proteins embedded within it and carbohydrates attached to its surface. the scientists are particularly interested in the role of cholesterol, a lipid that is crucial for maintaining the membranes fluidity and stability at different temperatures. they hypothesize that the amount of cholesterol in the membrane changes seasonally, helping the cells adapt to the cold. the phospholipids in the cell membrane have a unique structure that makes the membrane selectively permeable. which statement accurately describes the regions of a phospholipid and how they contribute to this property? both the \heads\ and \tails\ are hydrophilic and allow all substances to pass freely through the membrane the hydrophilic \heads\ are attracted to water and face both the internal and external environments of the cell, while the hydrophobic \tails\ are repelled by water and form the nonpolar interior of the membrane the hydrophilic \head\ is repelled by water and faces the inside of the membrane, while the hydrophobic \tails\ are attracted to water and face the cells exterior the hydrophobic \heads\ form a barrier to water, while the hydrophilic \tails\ allow water - soluble substances to pass through

Explanation:

Phospholipids have hydrophilic heads and hydrophobic tails. The hydrophilic heads face water - based environments (inside and outside the cell) and the hydrophobic tails form the non - polar interior of the membrane, creating a selectively permeable barrier.

Answer:

The hydrophilic "heads" are attracted to water and face both the internal and external environments of the cell, while the hydrophobic "tails" are repelled by water and form the nonpolar interior of the membrane.