Explain the lytic cycle with reference to certain viruses .

Explanation

T- even Bacteriophages that attack the bacterium E.coll cause lysis of the cells and are called virulent phages . They show lytic cycle ,which is a five step process involving (a) attachment (b) penetration (c ) Biosynthesis (d) maturation and (e ) release
(a) Attachment : - The tail fibres of phages oof help in attachement to the complementary receptor sites on the bacterial cell wall .
(b) Penetration : - The tail sheath oof phage contracts and the tail core is driven in through the bacterial cell . The capsid remains outside the bacterial cell and is called ghost . Thus the phage particle functions like hypodermis syringe and injects its DNA into the bacterial cell .
(c ) Biosynthesis : - When the phage DNA reaches the cytoplasm of the host cell , many copies of phage DNA, enzymes ,and capsid proteins are synthesized using the cellular machinery of the host cell .
(4) Maturation : - Bacteriophage DNA and capsids are assembled into complete virions . This period of time between the infection by a virus and the appearance of mature virions is called Eclipse period .
(e ) Release :- The plasma membrane of the host cell gets disolved or lysed due to viral enzyme, lysozyme .The bacterial cell wall breaks , releasing the newly produced phage particles or virions .