Has a Membranous Layer External to the Nucleocapsid?
The Capsid Is Composed of Smaller Protein Components Referred to as Capsomers. the Capsid+Genome Combination Is Called a Nucleocapsid. Viruses Can Also Possess...
The capsid is composed of smaller protein components referred to as capsomers. The capsid+genome combination is called a nucleocapsid. Viruses can also possess additional components, with the most common being an additional membranous layer that surrounds the nucleocapsid, called an envelope.
Do viruses have an external membrane?
In addition to the capsid, some viruses also have an external lipid membrane known as an envelope, which surrounds the entire capsid. Viruses with envelopes do not provide instructions for the envelope lipids. Instead, they "borrow" a patch from the host membranes on their way out of the cell.
Do all viruses have an external membrane or envelope?
Not all viruses have envelopes. The envelopes are typically derived from portions of the host cell membranes (phospholipids and proteins), but include some viral glycoproteins. They may help viruses avoid the host immune system.
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