Final answer:
The statement is False because filamentous phages are released without lysing the bacterial cell, which is distinct from the release process of lytic phages where cell lysis occurs.
Step-by-step explanation:
The statement, 'Completed filamentous phages are often found in the cytoplasm of infected bacteria', is False. Filamentous bacteriophages, such as fd, M13, and λ (lambda), typically assemble within the infected bacterial cell and are released without lysing the cell, a process distinct from that of lytic phages such as T4. Lytic bacteriophages, which follow the lytic cycle, indeed result in the production of new phages that are released through cell lysis, disrupting the cytoplasmic integrity and causing the release of progeny virions into the environment. In contrast, lysogenic bacteriophages such as lambda phage can integrate their DNA into the bacterial chromosome, becoming a prophage during the lysogenic cycle, without producing new virions immediately. Additionally, viruses that infect plant or animal cells, like herpesviruses, may enter a state of latency similar to bacteriophage lysogeny, residing in the host without producing virions.