Question

Plasmalemma is made of

• A. A single protein layer
• B. Single lipid layer
• C. Single lipid layer and two protein layers
• D. Single protein and single lipid layer

Answer 1

The correct option is C Single lipid layer and two protein layers

• The cell membrane or plasmalemma is a phospholipid bilayer that are selectively permeable membranes which separate the interior of the cells (cell organelles and cytoplasm) from the outside environment or the extracellular space.
  
• The cell membrane is a trilayer as it consists of a layer of phospholipids which forms the hydrophobic part which is sandwiched between two layers of hydrophilic heads (trilaminar).
  
• So, the correct answer is 'Single lipid layer and two protein layers'.