NEET BIOLOGY

Detailed explanation-1: -Phages that replicate only via the lytic cycle are known as virulent phages while phages that replicate using both lytic and lysogenic cycles are known as temperate phages. In the lysogenic cycle, the phage DNA first integrates into the bacterial chromosome to produce the prophage.

Detailed explanation-2: -Virulent phage: Phage which displays only lytic cycles (no chronic or lysogenic cycles). Temperate phage: Phage which can undergo either virion-productive or lysogenic cycles. Prophage: Phage genome that replicates with its host cell while not generating virion progeny.

Detailed explanation-3: -one of two life cycles, lytic (virulent) or lysogenic (temperate). Lytic phages take over the machinery of the cell to make phage components. They then destroy, or lyse, the cell, releasing new phage particles.

Detailed explanation-4: -Examples include T2, T4, T6 (T-even phages), they are also known as virulent phages. The bacterial cell is completely destroyed immediately after replication of the viral genome. This type of infection is called virulent infection and it is mostly used for phage therapy.

Detailed explanation-5: -When a virulent phage infects its host, it will produce many progeny as soon as the phage’s DNA is injected into the host cell and then causes the death of the host through bacterial lysis [15]. In contrast, temperate phages can undergo the lysogenic cycle and lytic cycle.