What Are the Five Phases of the Bacteriophage Lytic Cycle?

The five phases of the lytic cycle of the bacteriophage are adsorption and penetration, synthesis of early proteins and phage DNA, synthesis of late proteins, assembly and lysis of the host cell. The lysis of the host cell releases bacteriophages.

The bacteriophages released spread to other cells and infect them, repeating the cycle. The life cycle of the bacteriophage takes about 25 to 35 minutes to complete. The life cycle of the bacteriophage is referred to as the lytic cycle because lysis of the host cell occurs at each cycle. Bacteriophages are viruses that infect bacteria.

In the first phase ? adsorption ? the phage sticks onto the outside of the host cell. After that, the tail of the bacteriophage penetrates the host cell and injects DNA into the host bacteria cell. The bacteriophage DNA within the host cell then directs the synthesis of proteins and phage DNA to make multiple copies of phages. The bacteria host cell provides the ribosomes and energy for synthesis of new phage proteins and DNA. The proteins and DNA are assembled into bacteriophages. The bacteriophages produce lysozyme to lyse the wall of the host cell, enabling the newly synthesized and assembled phages to be released.