Question

Which of the following best describes the cell membrane?

a
a waterproof layer of polysaccharides connected by short chains of amino acids
a thick layer of proteins and carbohydrates
a double layer of phospholipids
a web of protein fibers

Answer 1

The cell membrane is a double layer of phospholipids that regulates the movement of substances in and out of the cell.

Step-by-step explanation:

The best description of the cell membrane is a double layer of phospholipids. The cell membrane is made up of a phospholipid bilayer in which the hydrophilic (water-loving) heads face outward, while the hydrophobic (water-repelling) tails face inward. This structure allows the cell membrane to regulate the movement of substances in and out of the cell.

Learn more about Cell membrane structure and function