Which Portion of the Lambda Phage Can Be Excised and Used

Question

Which portion of the lambda phage can be excised and used for the insertion of foreign DNA?
A) The external portions required for lytic growth
B) The central portion required for lysogenic growth
C) The external portions required for lysogenic growth
D) The central portion required for lytic growth
E) No part can be excised, but extra DNA can be added in

Accepted Answer

The central portion of the lambda phage, which contains the phage repressor gene, can be excised and foreign DNA can be inserted in its place. This region is required for lysogenic growth.