Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Diagram of a Cytomegalovirus. The capsid encloses the genetic material of the virus. The envelope which surrounds the capsid is typically made from portions of the host cell membranes (phospholipids and proteins). Not all viruses have a viral envelope. Answer: the capsid
A:
What encloses the genetic material of the virus?