Question

Cell membranes are made of

• A. Phospholipids and proteins
• B. Pectin
• C. Cellulose
• D. Lipid and hemicellulose.

Answer 1

Answer: (A)

Phospholipids and proteins

• The cell membrane 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 consists of a layer of phospholipids which forms the hydrophobic part which is sandwiched between two layers of hydrophilic heads.
  
• The protein molecules are embedded in the lipid bilayer and some amount of carbohydrates are also present in the cell membrane.
  
• So, the correct answer is 'Phospholipids and proteins'.