In pBR322, the restriction site where insertional inactivation could not be achieved is
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a
BamH I
b
PvuI
c
Sal I
d
Cla I
answer is D.
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Detailed Solution
Cla I is the restriction site where insertional inactivation could not be achieved because it is not present in the region of marker genes. BamH I and Sal I are present in tetR marker region and Pvu I is present in ampR marker region.