Which of the following is NOT listed as a stage in the virus life cycle?

• A. Design
• B. Replication
• C. Launch
• D. Persistence

Answer: (D)

The virus life cycle is described by a sequence of core steps the virus goes through to replicate and spread, including attachment, entry, uncoating, replication of its genome, production of viral proteins, assembly of new virions, and release from the host cell. Among the options, replication is a definite part of that cycle, as the virus must copy its genome and make viral proteins to build new particles. Terms like design and launch aren’t standard parts of how virologists describe the lifecycle; they aren’t used to label steps in the replication-assembly-release sequence. Persistence, however, is a state the infection can take—long-term presence of the virus or a latent/ongoing infection—but it isn’t a discrete step in the lifecycle itself. It describes the outcome rather than a specific phase the virus passes through in its replication process. Therefore, persistence is not listed as a stage in the virus life cycle.