Virus, Viroids and Prions — Predicted 2026
AI-Predicted Question Angles for UPSC 2026
Comparative Analysis of Structural Components
highNEET frequently tests the ability to differentiate between these acellular entities. A question comparing the presence/absence of genetic material, protein coat, and type of nucleic acid (DNA/RNA, ss/ds) across viruses, viroids, and prions is highly probable. Students should be able to quickly identify which agent possesses which component and which lacks it. For example, a question might ask to identify the correct match of an infectious agent with its structural components.
Disease-Causative Agent Matching
highLinking specific diseases to their correct causative agent (virus, viroid, or prion) is a fundamental and frequently tested concept. Questions will likely present a list of diseases and ask to identify the one caused by a specific type of agent, or to match diseases with their respective agents. Examples like HIV, influenza, Potato Spindle Tuber Disease, BSE, and Creutzfeldt-Jakob disease are prime candidates for such questions.
Mechanism of Infection/Replication
mediumWhile less frequent than structural comparisons, understanding the unique ways these agents propagate is important. A question might focus on the prion's mechanism of protein misfolding, or the viroid's reliance on host RNA polymerase, or the general viral lytic/lysogenic cycles. This tests a deeper conceptual understanding beyond mere structural recall. For instance, 'Which infectious agent propagates by inducing conformational changes in host proteins?'
Reason for Exclusion from Five-Kingdom Classification
mediumThis is a core conceptual point that justifies grouping these agents separately. Questions might ask why viruses, viroids, and prions are not considered part of the five kingdoms, focusing on their acellular nature and obligate parasitic lifestyle. This tests the understanding of the fundamental criteria for biological classification.