Phospholipids are molecules that have two regions, the head and the tail, with distinct chemical properties. Classify the descriptions as characteristics of the heads or tails of phospholipids.

The head  is described as being hydrophilic  and polar . Whereas the tail region is hydrophobic (i.e., it does not interact with water) and is rich in hydrocarbons.

Explanation:

These particular properties of the phospholipid molecule is what allows for the structure of membrane to be possible. The phospholipid bi-layer is what holds the cell together so its importance cannot possibly be overstated!

So pepsin is basically a gastric juice which is produced in the stomach.