Which Observation Can Be Used as Evidence That the Cell

Multiple Choice

Which observation can be used as evidence that the cell membrane has a fluid nature?

A) In the laboratory, two cells from different species can be fused together to make one large cell.
B) Images obtained using freeze-fracture electron microscopy reveal that the membrane contains embedded proteins.
C) Chemical analysis reveals that cell membranes contain phospholipids, proteins, and cholesterol as major components.
D) Analysis of the amino acids present in protein regions embedded in cell membranes show that they mainly have hydrophobic side chains.
E) The cholesterol content in cell membranes varies depending on cell type, and it is generally higher than in organelle membranes.