9.5 Virus Multiplication:Attachment and Penetration Example:T4 phage (a)Unattached virion. (b)Attachment to the (c)Contact of cell wall by the wall by the long tail tail pins尾针. fibers尾丝interacting with core polysaccharide. (d)Contraction of the tail sheath尾鞘and injection of the DNA. Lipopolysaccharide layer(outer membrane) Peptidoglycan Cytoplasmic membrane9.5 Virus Multiplication: Attachment and Penetration (a) Unattached virion. (b) Attachment to the wall by the long tail fibers尾丝 interacting with core polysaccharide. (c) Contact of cell wall by the tail pins尾针. (d) Contraction of the tail sheath 尾鞘and injection of the DNA. Example: T4 phage