11.3 Functional Class Class I C|assⅢl clustering in phages T and T4 6 genes 7 genes 13 genes RNA polymerase ■■■■■■■ Host interference Figure 11. 5 Phage T7 contains thre ee classes DNA synthesis ■■■■■ of genes that are isozyme expressed sequentially. The Heads tails genome Is-38 kb DNA maturation 消当Figure 11.5 Phage T7 contains three classes of genes that are expressed sequentially. The genome is ~38 kb. 11.3 Functional clustering in phages T7 and T4