Which one of the following is an example of lysogenic conversion?
A. Elimination of temperate phage
B. Induction of the lytic phase
C. Production of immunity to superinfection
D. Prophage controlled toxogenicity
E. Replication of virulent phage.
The correct answer is **D. Prophage controlled toxogenicity**.
Lysogenic conversion refers to the phenomenon where a bacterium gains new properties, such as toxin production, due to the presence of a prophage (a dormant form of a bacteriophage) integrated into its genome. This can result in changes to the bacterial phenotype, such as the production of toxins.