See also. 1  Concept inventory. 2  Constructive alignment. 3  Educational assessment. 4  Ipsative assessment. 5  Norm-referenced assessment. 6  Psychometrics. 7  Standardized test.
Enveloped viruses have a lipid-based membrane surrounding the protein capsid. This envelope is partly composed of the cell membrane within which the virus replicated, and it contains proteins and carbohydrates. Some of the proteins are from the host cell and some are from the virus..
1 A membranous envelope surrounds the capsids of flu viruses. 2  These viral envelopes are derived from the membrane of the host cell. 3  They also have some host cell viral proteins and glycoproteins, as well as molecules of viral origin. 4  Some viruses carry a few viral enzyme molecules within their capsids.