SCIENCE
VIRUS AND BACTERIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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single stranded RNA and causes diseases in a plant
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any things that causes a disease
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prion
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a living cell
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Detailed explanation-1: -Viroids are minimal RNA replicons composed by a single-stranded and highly structured circular small RNA able to infect plants and induce diseases. Viroids lack protein-coding capacity and are therefore parasites of their host transcription machinery.
Detailed explanation-2: -Viroids are single-stranded covalently closed circular RNA molecules existing as highly base-paired rod-like structures.
Detailed explanation-3: -Viroids are single-stranded, circular, and noncoding RNAs that infect plants. They replicate in the nucleus or chloroplast and then traffic cell-to-cell through plasmodesmata and long distance through the phloem to establish systemic infection. They also cause diseases in certain hosts.
Detailed explanation-4: -Viroids are small and infectious RNA particles that do not code for proteins. They do not possess the protein coat. They are known to infect the plants.
Detailed explanation-5: -In plants, viroids cause a variety of diseases like citrus exocortis, cucumber pale fruit, chrysanthemum stunt, etc. Symptoms: Stem and leaf necrosis is very common, even death of the whole plant, and chlorosis of leaves occur.