Which labeled virus structure in the diagram above is responsible for attaching the virus to the host cell?

• A. Viral genome
• B. Capsid
• C. Matrix protein
• D. Envelope glycoprotein spikes

Answer: (D)

Verified step by step guidance

1. Understand that viruses attach to host cells using specific structures that recognize and bind to receptors on the host cell surface.
2. Identify the viral genome as the genetic material inside the virus, which is not involved in attachment but in replication once inside the host.
3. Recognize the capsid as the protein shell that encases the viral genome, providing protection but not directly responsible for attachment.
4. Know that matrix proteins are located between the capsid and the envelope, providing structural support but not involved in binding to host cells.
5. Focus on envelope glycoprotein spikes, which protrude from the viral envelope and are specialized for recognizing and binding to host cell receptors, thus mediating attachment.