Answer
(a) Protein
Work Step by Step
A protein is a chemical component that is found in all viruses. This protein is called capsid. Viruses are classified by the nucleic acid they contain.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.