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B
Virion
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C
Provirus
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D
Virus
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Solution
The correct option is B Virion
Viruses are acellular structure and are composed of rigid protein shell (capsid) surrounding nucleic acid (ss or ds RNA or DNA).
Viroids are the smaller infectious pathogens that consist of only nucleic acid and no protein coat. Thus, a virus without its protein coat is termed a viroid.
The complete, infective form of a virus outside a host cell, with a core of RNA or DNA and a capsid, is known as Virion.
Integration of genome of temperate phage with that of host DNA leads to the formation of the provirus.