The tails of the phospholipids of the plasma membrane are...

The tails of the phospholipids of the plasma membrane are composed of ______ and are _____?
a. phosphate groups; hydrophobic
b. fatty acid groups; hydrophilic
c. phosphate groups; hydrophilic
d. fatty acid groups; hydrophobic

Key Concepts

Phospholipid Structure

Phospholipids are molecules that consist of a hydrophilic (water-attracting) head and one or more hydrophobic (water-repelling) tails. This dual nature is critical for the molecule's role in forming cellular membranes, as it allows the formation of a bilayer that separates the cell from its environment.

Fatty Acid Tails

The tails of phospholipids are made up of fatty acid chains, which are long sequences of hydrocarbons. Their non-polar chemical structure makes them hydrophobic, meaning they repel water, which is essential for maintaining the integrity of the lipid bilayer in cell membranes.

Hydrophobic and Hydrophilic Properties

The concepts of hydrophobicity and hydrophilicity refer to a molecule’s affinity or aversion to water. In phospholipids, the hydrophilic head interacts with water, while the hydrophobic fatty acid tails avoid it, a characteristic that drives the self-assembly of membranes in aqueous environments.

Plasma Membrane Composition

The plasma membrane is primarily composed of a phospholipid bilayer, which forms the fundamental structure of the cell's outer boundary. The arrangement of hydrophilic heads facing the extracellular and cytosolic environments, with hydrophobic tails sequestered inside, is key to its function in controlling the passage of substances into and out of the cell.

Transcript

Please give Ace some feedback