Fact 1: Some viruses have an envelope of phospholipids and proteins.

Fact 2: Phospholipids are body fats, too.

Given the two facts above, answer the question "Viral envelopes are sometimes made of fats and what?" with the following options: 
- cellulose
 - glucose
 - Energy.
 - protein
 - viral particles
 - Energy
 - food
 - bacteria


 

    protein     