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

Fact 2: Intrinsic proteins are embedded in the phospholipid.

Given the two facts above, answer the question "Name one kind of a protein that some viruses have inside their phospholid envelope?" with the following options: 
- layers of fat
 - more abundant
 - positive
 - negative
 - allow growth
 - Leptospirosis
 - intrinsic
 - bioaerosols


 

       intrinsic  