Question

use the diagram above to answer the next question. the fluid - mosaic model of the membrane states that polymers formed from the molecule shown above select one: a. are floating in a double layer of cholesterol. b. make up a double layer in the cell membrane. c. are dispersed throughout to control the fluidity of the cell membrane. d. are embedded in a double layer of phospholipids.

Explanation:

The molecule shown is an amino - acid. Proteins (polymers of amino - acids) are embedded in a double - layer of phospholipids in the fluid - mosaic model of the cell membrane. Phospholipids form the basic structure of the membrane (a bilayer), and proteins are dispersed within it performing various functions like transport, signaling etc. Cholesterol controls membrane fluidity but proteins are not floating in a cholesterol bilayer. Proteins do not make up the double layer of the membrane (phospholipids do). And proteins are not dispersed to control fluidity (cholesterol does that).

Answer:

d. are embedded in a double layer of phospholipids.