. Biological order. Biology. VIRAL FUNCTIONS: ORDER AND DISORDER infection the genetic material of the bacteriophage starts multi- plying. After 12 to 20 minutes, the phage DNA is condensed into a ball, and the subunits of the head are assembled around the ball. <v/w» genetic material of the bacteriophage — phage proteins • endolysine Figure 26. The Life Cycle of a Bacteriophage. 1. Infection: (a) the bacteriophage particle has attached onto the receptive bacterium; (b) it has injected its genetic material into the bacterium. 2. Beginning of the vegetative phase: Phage proteins are produced
. Biological order. Biology. VIRAL FUNCTIONS: ORDER AND DISORDER infection the genetic material of the bacteriophage starts multi- plying. After 12 to 20 minutes, the phage DNA is condensed into a ball, and the subunits of the head are assembled around the ball. <v/w» genetic material of the bacteriophage — phage proteins • endolysine Figure 26. The Life Cycle of a Bacteriophage. 1. Infection: (a) the bacteriophage particle has attached onto the receptive bacterium; (b) it has injected its genetic material into the bacterium. 2. Beginning of the vegetative phase: Phage proteins are produced, and the autonomous multiplication of the phage genetic material is initiated. The bacterial chromosome c is disintegrating. 3. The bacterial chromosome has disappeared. Its building blocks (nucleic bases) will be incorporated in the phage genetic material. More phage material has been synthesized. 4. The proteins are organized around the folded genetic material, and phage particles are formed. A lytic enzyme (endolysine) will be produced by the vegetative bacteriophage. The bacterial wall will be hydrolyzed and the bac- terium will l)-se, thus liberating the bacteriophage particles. of nucleic acid. Finally, by a process that is not understood, the tail appears \yhere it should appear. The infectious particle is formed. In the meantime, a peculiar phage protein has been produced, the endolysine, \yhich in the particle \vill be localized at the tip of the tail. This endolysine depolymerizes the mucopolysaccharides of the bacterial wall. The bacterium is lysed and liberates some hundred [67]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lwoff, André, 1902-. Cambridge, M. I. T. Press
Size: 2286px × 1093px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbiology
