Viral Structure and Common Diseases — NEET Biology
📚 Practice ConceptGive a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.
Which of the above statements are NOT correct? S1: Viruses are obligate intracellular parasites and are characterized by an inert crystalline structure outside the host cell. S2: The genetic material in viruses can be either RNA or DNA, and some complex viruses may contain both. S3: Viroids are infectious agents smaller than viruses, composed of free RNA of high molecular weight, but without a protein coat. S4: Prions are infectious proteins that cause neurodegenerative diseases such as mad cow disease in cattle and Creutzfeldt–Jacob disease in humans. S5: Lichens are symbiotic associations where the fungal component (mycobiont) prepares food for the algal component (phycobiont).
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