(a) Name the selectable markers in the cloning vector pBR322? Mention the role they play. (b) Why is the coding sequence of an enzyme β−galactosidase a preferred selectable marker in comparison to the ones named above? [3]

(a) Name the selectable markers in the cloning vector pBR322? Mention

1.	(a) Name the selectable markers in the cloning vector pBR322? Mention the role they play. (b) Why is the coding sequence of an enzyme β−galactosidase a preferred selectable marker in comparison to the ones named above? [3]
Answer» (a) Name the selectable markers in the cloning vector pBR322? Mention the role they play. (b) Why is the coding sequence of an enzyme $β -$ galactosidase a preferred selectable marker in comparison to the ones named above? [3]