What is meant by the following statement?
the cell membrane is said to be fluid.
a. it moves sideways.
b. it fills up with water.
c. it remains very rigid.
d. it looks like a liquid.

D

Explanation:

The cell membrane behaves like a liquid even becoming more fluid with an increase in temperatures. This is due to its compostion of a phospholipid bilayer with embedded molecules within it (such as cholesterol and cell membrane proteins). The embedded moleculea are not locked in one position and can move position along the membrane like an particle in water proven by The Frye-Edidin experiment.