Toxin production by conjnebacterium diphtheriae is due to ?
Ans. is 'c' i.e., Lysogenic conversion . The toxigenicity of the diphtheria bacilli depends on the presence in it of corynephages (tox +). Nontoxigenic strains may be rendered toxigenic by infecting them with beta phage or some other larger phage. This is known as lysogenic conversion or phage conversion.
Chromosomal mutation
Presence of plasmid
Lysogenic conversion
Transformation