Identifying viral structural components

Steps:

• Examine the diagram for genetic material: it depicts double-stranded DNA in the core.
• Identify the outer protein shell: labeled as proteins forming the capsid.
• Note the lipid bilayer envelope: marked as phospholipids surrounding the capsid.
• Observe surface projections: labeled as carbohydrates in glycoproteins for attachment.

Why B is correct:

• Enveloped DNA viruses, per virology classification, contain DNA genome, protein capsid, phospholipid envelope, and carbohydrate moieties on spikes (e.g., herpesvirus structure).

Why the others are wrong:

• A: Incorrectly identifies genetic material as RNA instead of DNA.
• C: Uses RNA for genome and duplicates proteins, omitting phospholipids for the envelope.
• D: Specifies RNA genome and duplicates phospholipids, excluding carbohydrates on surface proteins.

Final answer: B