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Virion is
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Important Questions on Biological Classification
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Which of the following statements regarding viruses is/are correct?
(i) These are cellular, infectious, nucleoprotein particles.
(ii) They can be grown in a culture medium.
(iii) Genetic material is either DNA or RNA, but never both.
(iv) They can be crystallized.
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Refer to the given figure and select the correct option.
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Given is an electron microscopic structure of a bacteriophage. Identify the labelled parts P, Q, R, S and T and select the correct option.
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Select the pair that consists of viral diseases.
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Which one of the following is an incorrect pair?
| (i) | (A) | Louis Pasteur | Coined the term 'virus' |
|---|---|---|---|
| (ii) | (B) | Beijerinck | Contagium vivum fluidum |
| (iii) | (C) | Ivanovsky | Discovered retroviruses |
| (iv) | (D) | Stanley | Crystallised TMV |
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In plants, mosaic formation, leaf rolling and curling, yellowing of plant parts, vein clearing, dwarfing and stunted growth, necrosis etc. are the symptoms of
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Which of the following is not a viral disease of plants?
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Read the given statements that describe certain infectious particles.
(i) It was discovered by T.O. Diener and was found to be smaller than viruses.
(ii) It causes potato spindle tuber disease.
(iii) It is a free RNA particle that lacks the protein coat.
(iv) It has low molecular weight RNA as genetic material.
Which of the following is referred to here?
