Answer :
Final answer:
Phage particles that contain only bacterial DNA are characteristic of generalized transduction, which happens during the lytic cycle and involves random packaging of the host DNA into the phage head.
Explanation:
Phage particles that contain only bacterial DNA without any viral DNA are characteristic of generalized transduction. During this process, which occurs in the lytic cycle of both virulent and temperate bacteriophages, phage capsids inadvertently package segments of the bacterial host's DNA.
When the transducing phage infects another bacterium, it injects the bacterial DNA, which may integrate into the new host's chromosome and express the transferred genes.
In contrast, specialized transduction involves only the transfer of specific bacterial genes that are located adjacent to the phage DNA in the host genome.
This occurs when a temperate phage enters the lysogenic cycle; during induction, when the phage excises itself from the bacterial chromosome, it may accidentally include adjacent bacterial genes. The resulting phage particles contain both phage and specific bacterial DNA, which they then transfer to another host.
