Which of the following best describes the components of a viral nucleocapsid?

• A. Envelope and capsid protein
• B. Nucleic acid and capsid protein
• C. Capsid protein and glycoproteins
• D. Nucleic acid and envelope

Answer: (B)

Verified step by step guidance

1. Understand the term 'nucleocapsid': it refers to the complex formed by the viral nucleic acid (genetic material) and the protein coat that surrounds it, called the capsid.
2. Recall that the capsid is made up of capsid proteins, which protect the viral nucleic acid and help in its delivery into host cells.
3. Recognize that the envelope is a separate structure that surrounds some viruses but is not part of the nucleocapsid itself; it is derived from the host cell membrane and contains viral glycoproteins.
4. Identify that glycoproteins are embedded in the viral envelope and are important for virus attachment and entry but are not components of the nucleocapsid.
5. Conclude that the nucleocapsid consists specifically of the viral nucleic acid and the capsid protein, making 'Nucleic acid and capsid protein' the best description.