Is there any organism similar to viruses but smaller than it ? Write about it.
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Viriods :
Viriods were discovered by T. O. Deiner in 1971. As the name indicates, they lack the protein coat that is found in viruses. They are infectious, so cause potato spindle tuber disease. They are smaller than viruses and are found as free RNA. Their RNA is of low molecular weight. Just like viruses, viroids are also exception from cell theory and five kingdom classification.
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Here is your answer.
Viriods :
Viriods were discovered by T. O. Deiner in 1971. As the name indicates, they lack the protein coat that is found in viruses. They are infectious, so cause potato spindle tuber disease. They are smaller than viruses and are found as free RNA. Their RNA is of low molecular weight. Just like viruses, viroids are also exception from cell theory and five kingdom classification.
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Viroids (literally known and given as a meaning, by Louis Pasteur, virus means poison, eidos translates to diminutive):
Self-replicating organisms or particles which are smallest to their own entity to virus which was discovered by Diener (1971). Viroids are some infectious RNA particles that are devoid or not having the protein coating on the external layer. They are obligate parasites, equal too, viruses, since they too are obligate parasites. The total Molecular weight of the viroid is low (almost empty) . The RNAs have a tightly folded linear structure to form a circular and straight structure. Viroids are known to cause diseases (about 20 of them reported) in plants only, such as, Potato spindle tuber, chrysanthemum stunt. Animal or human infections are not known currently to the community of medical professionals and scientists. Viroid does not or never produces a protein as it does not possess an initiation codon (present in humans to code gene and DNA strands from one end to another). The mechanism of disease production, is, also not very clear to the scientific community. The Viroids or viroid particles can multiply or divide by both RNA dependent and DNA dependent replication according to the transcription it has performed.
Self-replicating organisms or particles which are smallest to their own entity to virus which was discovered by Diener (1971). Viroids are some infectious RNA particles that are devoid or not having the protein coating on the external layer. They are obligate parasites, equal too, viruses, since they too are obligate parasites. The total Molecular weight of the viroid is low (almost empty) . The RNAs have a tightly folded linear structure to form a circular and straight structure. Viroids are known to cause diseases (about 20 of them reported) in plants only, such as, Potato spindle tuber, chrysanthemum stunt. Animal or human infections are not known currently to the community of medical professionals and scientists. Viroid does not or never produces a protein as it does not possess an initiation codon (present in humans to code gene and DNA strands from one end to another). The mechanism of disease production, is, also not very clear to the scientific community. The Viroids or viroid particles can multiply or divide by both RNA dependent and DNA dependent replication according to the transcription it has performed.
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