Question

Correct sequence of protein (P) and lipid (L) in cell membrane is (as per lamellar model)

• A. L-P-L-P
• B. L-P-P-L
• C. P-L-L-P
• D. P-P-L-L

Answer 1

Answer: (C)

P-L-L-P

• Davson and Danielli in the year 1935 proposed the Lamellar model.
• According to this model, the cell membranes are made up of lipid bilayers which are coated with thin sheets of protein.
• This model of cell membranes has a lipid centre which is surrounded by single layers of lipid that are covered by single protein layers.
• This theory is called pauci-molecular theory which illustrates that the cell membrane is a sandwich (protein-bilipid-protein) which are applicable to all biological membranes.
• So, the correct answer is 'P-L-L-P'.