b (b)According to chargaff $(1950)$ rules ${\rm{A }} + {\rm{ T }} \ne {\rm{G }} + {\rm{ C}}$.
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$A$ : Operator gene is functional when it is not blocked by repressor.
$R$ : Regulator gene produces active protein only which acts on operon system in $E$.coli
Arrangement of $DNA$ has the triplet base sequence $AAC\ GAC\ AGC\ GGC\ ACA\ AAA$. Due to mutation, the first base only got deleted. Then the likely effect of this on the coding of the $DNA$ segment is that