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21. Transfer of infection from cell to cell occurs mainly by direct transfer of virions via

A. plasmodesmata
B. ectodesmata
C. protonemata
D. none of these

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22. Intracytoplasmic inclusion bodies are found in cells infected with

A. Rabies virus
B. Vaccinia virus
C. Fowlpox virus
D. all of these

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23. What is the function of positive-strand in double-stranded RNA viruses?

A. Synthesis of protein
B. Production of ribosomes
C. Both (a) and (b)
D. None of these

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24. Which of the following virus is transmitted by the respiratory route?

A. Rhinovirus
B. Coronavirus
C. Measles virus
D. All of these

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25. The predominant lipid substance found in the viral envelope is

A. phospholipids
B. glycolipids
C. neutral fat
D. all of these

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