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Assertion : In transforming principle, w...

Assertion : In transforming principle, when streptococus pneumoniae (Pneumococcus) bacteria are grown on a culture plate, some produce smooth shiny colonies (S) while other produce rough colonies (R).
Reason : S strain bacteria have a mucous (polysaccharide) coat, while R strain does not.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
`**` When Streptococcus pneumoniae (pneumococcus) bacteria are grown on a culture plate, some produce smooth shiny colonies (S) while others produce rough colonies (R).
`**` This is because the S strain bacteria have a mucous (polysaccharide) coat, while R strain does not.
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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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Assertion (A): In Griffith's experiment, the dead R strain bacteria was capable of causing the transformation of the live S-strain bacteria. Reason(R): The S-strain is non-virulent strain.

Eight people L, M, N, O, P, Q, R and S are sitting around a circular table with equal distance between each other but not necessarily in the same order. Some of them are facing the centre while some are facing outside. i.e away from the centre) M sits third to the left of L. Only three people sit between M and S. P sits to the immediate right of S. Immediate neighbours of P face opposite directions(i.e. if one neighbour faces the centre then the other neighbour faces outside and vice-versa.) Only one person sit between P and O. R sits second to the right of O. Both R and N face the same direction as S.(i.e if S faces the centre then R and N also faces the centre and vice-versa.) Immediate neighbours of Q faces opposite directions(i.e if one neighbour faces the centre then the other neighbour faces outside and Vice-versa.) P does not face outside. O faces a direction opposite to that of M. How many people sit between L and Q when counted from the left of Q ?

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