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  4. Viruses that infect bacteria multiply and cause their lysis, are called

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Q. Viruses that infect bacteria multiply and cause their lysis, are called

AIPMTAIPMT 2004Biological Classification

Solution:

Viruses like bacteriophage T4 undergo lytic cycle that involves lysis of bacteria. The replication cycle of bacteriophage T4 consists of following phases
(i) Adsorption of the phage to bacterial or host cell. Then the viral genetic material penetrates into the host cell.
(ii) Eclipse period involves the synthesis of new phage DNA and proteins.
(iii) Maturation involves the assembly of phage DNA into the protein coat.
(iv) Lysis of host cell occurs and releases infective progeny phases.