Question

The cell membrane is described as being fluid because:

A. the phosphate groups move between fatty acids.
B. the membrane lets materials pass through it.
C. the fatty acid chains are inside it.
D. the phospholipids move from side to side.

Answer 1

the membrane lets materials pass through it.

Answer 2

B. the membrane lets materials pass through it.

Since the cell membrane is semi permeable in nature.