Question

Which of the following is NOT the property of plasmid?

(a) Rolling circle replication

(b) Narrow host range

(c) Two closely related plasmids cannot coexist in the same cell

(d) Encodes gene products that are essential for growth

I have been asked this question in semester exam.

I'm obligated to ask this question of Bacterial Genome topic in division Prokaryotes and Viruses of Life Sciences

Answer 1

Correct option is (b) Narrow host range

To explain I would say: Plasmids can have narrow as well as broad host range as when it exists only in a limited number of closely related bacteria, it shows narrow host range while if it transferred to and maintained in a large number of bacteria, it shows broad host range.