Describe the five phases of a generalized lytic replication cycle.

Guida verificata passo dopo passo

Step 1: Understand that the lytic replication cycle is a process by which a bacteriophage infects a bacterial cell, replicates itself, and causes the host cell to lyse, releasing new phage particles.

Step 2: Describe the Attachment phase, where the phage recognizes and binds specifically to receptors on the surface of the bacterial host cell.

Step 3: Explain the Penetration phase, during which the phage injects its genetic material (DNA or RNA) into the host cell, leaving the capsid outside.

Step 4: Outline the Biosynthesis phase, where the phage genome directs the host's machinery to replicate phage nucleic acids and synthesize phage proteins.

Step 5: Detail the Maturation and Release phases: Maturation involves assembly of new phage particles inside the host, and Release occurs when the host cell lyses, releasing the newly formed phages to infect other cells.

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Attachment and Entry

This phase involves the virus recognizing and binding to specific receptors on the host cell surface, followed by the injection or entry of viral genetic material into the host. It is the initial step that determines host specificity and initiates infection.

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03:12

Animal Viruses: 1. Attachment to the Host Cell

Replication and Synthesis

During this phase, the viral genome is replicated, and viral proteins are synthesized using the host's cellular machinery. This step is crucial for producing new viral components necessary for assembling progeny viruses.

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04:26

Animal Viruses: 3. Synthesis & Replication

Assembly and Release

New viral particles are assembled from replicated genomes and synthesized proteins. Once mature, viruses are released from the host cell, often causing cell lysis, which completes the lytic cycle and allows infection of new cells.

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