Observe the diagram and answer the question.

The cloning vector in the diagram is denoted as:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → pBR322
Option (4) pBR322 — Correct. The vector shown, with the ori, rop, the ampR and tetR genes and the restriction sites, is the E. coli cloning vector pBR322.