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There are 5 test tubes having a culture ...

There are 5 test tubes having a culture medium containing rough colonies of streptococcus pneumoniae. The following substances were added in them. Which of these test tubes will show smooth colonies of streptococcus pneumoniae on incubation for some time?
Test tube I: RNA from a heat-killed smooth strain of streptococcus pneumoniae
Test tube II: DNA from a heat-killed smooth strain of streptococcus pneumoniae
Test tube III: Protein from a heat-killed smooth strain of streptococcus pneumoniae
Test tube IV: Carbohydrate from a heat-killed smooth strain of streptococcus pneumoniae
Test tube V: Heat killed smooth strain of streptococcus pneumoniae incubated with DNAse enzyme

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