Question

what does the fluid mosaic model describe about the plasma membrane? the membrane is made only of lipids that never move. the membranes components are in constant motion within the lipid bilayer. the membrane allows all substances to pass freely without control. the membrane is a rigid structure with fixed proteins. why is the nucleus considered the control center of the cell?

Explanation:

The fluid - mosaic model posits that the plasma membrane is composed of a lipid bilayer with proteins embedded in it, and its components (lipids and proteins) are in constant motion. The nucleus contains DNA which holds the genetic information for cell activities, thus it controls the cell's functions.

Answer:

1. B. The membrane's components are in constant motion within the lipid bilayer.
2. It contains DNA which holds genetic information for cell activities.