Question

A cell membrane contains 60% proteins (density 1.33) and 40% phospholipids (density 0.92). When the membrane is centrifuged in NaCl solution (density 0.92), it will:

• A. float
• B. form a sediment
• C. form a layer in the centre of the NaCl column
• D. fragment in the NaCl column

Answer 1

The correct option is B

form a sediment

Protein is heavier, therefore the membrane will form a sediment.