[Campbell Biology P.99] The text mentions hydrophobic molecules as major ingredients of cel... | Practice Question

The text mentions hydrophobic molecules as major ingredients of cell membranes. If a cell membrane were primarily composed of hydrophilic substances, what would be the most likely consequence?

  • A: The cell membrane would become more rigid and less permeable to water.
  • B: The cell membrane would readily dissolve or break apart in aqueous environments, compromising cell integrity.
  • C: The cell would be unable to transport any substances, including water, across its membrane.
  • D: The cell would gain enhanced protection against osmotic lysis.

Explanation

Cell membranes are primarily composed of hydrophobic lipids, which form a barrier that repels water and prevents the cell from dissolving in its aqueous environment. If the membrane were made of hydrophilic substances, it would readily interact with and dissolve in water, leading to the breakdown of the cell structure and loss of cell integrity.