Which one of the following proteins is secreted by virus infected cells?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Interferons
Innate immunity has cytokine barriers among its defences. A cell infected with a virus makes and releases special proteins. These warn and protect the cells nearby.
(1) Antigens — Incorrect. An antigen is a foreign molecule, such as a protein on a pathogen, that triggers an immune response. It is not a protein made by the infected cell to give protection.
(2) Interferons — Correct. Virus-infected cells secrete interferons. These protect the non-infected cells from further viral infection.
(3) Lymph — Incorrect. Lymph is a fluid that carries lymphocytes. It is not a protein.
(4) Antibodies — Incorrect. Antibodies are made by B-lymphocytes and not by the infected cell. They belong to acquired immunity.
Note: A similar question was also asked in CUET (UG) 2026 on 26-05-2026 (Slot 1).
NCERT Extract:
Innate Immunity – …
