lab 9

between 10 and 300nm

small infectious agent that replicates only inside living cells of other organisms. it infects animals, plants, microorganisms including bacteria

free viral particles (outside the cell or in the process of infecting a cell).

DNA or RNA

protein coat

surrounding the capsid

viruses that infect bacteria

capsid in precursor form

a long continuous DNA molecule that contains multiple copies of the same DNA sequences linked in series

it wont fit into the procapsid. an enzyme cuts the DNA.

bacteriophage dsDNA that infects E. coli and other bacteria

the phage genome exists as a plasmid in the bacterium

Attachment: phage attaches to host cell

Penetration: phage penetrates host cell and injects its DNA

biosynthesis: phage DNA directs synthesis of viral components by the host cell.

maturation: assembly of phage particles called virions.

phage lysozyme breaks cell wall due high number of virions produced.

bacteriophage genome inserted and integrated into the circular bacterial DNA chromosome or existing as a plasmid

Process of unidirectional nucleic acid replication that can rapidly synthesize multiple copies of circular molecules of DNA.

protection of nucleic acid from destruction by DNAses

phage genome carrying genetic information necessary for replication of new phage particles.

retracts so that nucleic acid can pass from capsid into host cell’s cytoplasm

attachment of phage to specific receptor sites on a susceptible host’s cell wall.