Some viruses have an envelope of phospholipids and proteins, and intrinsic proteins are embedded in the phospholipid. Given these facts, name one kind of a protein that some viruses have inside their phospholid envelope among the following options:
- layers of fat
 - more abundant
 - positive
 - negative
 - allow growth
 - Leptospirosis
 - intrinsic
 - bioaerosols


 

       intrinsic  