Question

Conjugation can’t take place between________________

• A. F- and F+
• B. F’ and F-
• C. HFR and F-
• D. HFR and F+

Answer 1

Answer:

D. HFR and F+

For conjugation to take place one bacterium must have the F plasmid and other should lack it. HFR has the components of F plasmid within its genome so it can’t mate with another F+.