Viral replication sequence: Identify the correct chronological order of events in a typical productive viral replication cycle.

Introduction / Context:Although the details vary among DNA and RNA viruses, the core sequence of a lytic replication cycle follows a consistent logic from host recognition to progeny exit.

Given Data / Assumptions:

• Attachment (adsorption) precedes entry.
• Penetration and uncoating allow genome access to host machinery.
• Biosynthesis of nucleic acids and proteins precedes assembly (maturation).
• Release occurs last, by lysis or budding.

Concept / Approach:Think causally: you cannot synthesize viral components prior to entry, and you cannot release before assembly. Therefore the sequence is attachment → penetration (and uncoating) → biosynthesis → maturation (assembly) → release.

Step-by-Step Solution: Start with attachment to host receptors. Proceed to penetration and uncoating to free the genome. Perform biosynthesis of viral RNA/DNA and proteins. Assemble capsids and package genomes (maturation). Exit the cell via lysis or budding (release).

Verification / Alternative check:Textbook schematics for bacteriophages and animal viruses present this same order, differing mainly in entry and release mechanisms.

Why Other Options Are Wrong:Sequences that put release or maturation before biosynthesis violate causality; sporulation is a bacterial process, not viral.

Common Pitfalls:Forgetting uncoating is part of the early entry phase and mixing up assembly with synthesis.

Final Answer:Attachment, penetration, biosynthesis, maturation, release.