Multiple choice

The plasma membrane is an outer boundary and functional traffic-cop of every biological cell. It is composed of

  1. sterols

  2. phospholipids

  3. glycolipids

  4. lipoproteins

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

These are lipids containing a phosphate group. A phospholipid molecule has a strongly nonpolar and hydrophobic (water insoluble) tail region represented by fatty acid chains and a strongly polar or hydrophilic (water soluble) head region represented by the phosphate group. Such an arrangement forms a basic component of plasma membranes.