MCQ
$ECORI$ derives from ..........
- AEscherichia coli $RI$
- BEscherichia coli $RI\, 13$
- CEscherichia coli $RX\, 13$
- ✓Escherichia coli $RY\, 13$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

| List $-I$ | List $-II$ |
| $a$ In lac operon $i$ gene codes for | $i$ transacetylase |
| $b$ In lac operon $z$ gene codes for | $ii$ permease |
| $c$ In lac operon $y$ gene codes for | $iii$ $\beta$ - galactosidase |
| $d$ In lac operon $a$ gene codes for | $iv$ Repressor |
Choose the correct answer from the options given below :