1. Lytic phages lyse their host cells, whereas temperate phages either lyse their host or integrate their DNA into the host cell’s genome. Prophage DNA often codes for gene products that confer new properties on the host. Filamentous single-stranded DNA phages are extruded from the host cells without killing the cell. How can a productive phage infection not kill a host cell?
1. Lytic phages lyse their host cells, whereas temperate phages either lyse their host or integrate their DNA into the host cell’s genome. Prophage DNA often codes for gene products that confer new properties on the host. Filamentous single-stranded DNA phages are extruded from the host cells without killing the cell.
How can a productive phage infection not kill a host cell?
2. Peptidoglycan is a molecule unique to bacteria that provides strength to the cell wall. The Gram-positive cell wall is composed of a relatively thick layer of peptidoglycan as well as teichoic acids. Gram-negative cell walls have a thin layer of peptidoglycan and a lipopolysaccharide-containing outer membrane. Penicillin and lysozyme interfere with the structural integrity of peptidoglycan.
What is the significance of lipid A?
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