Bacterial chromosomes are often circular but sometimes linear. Some bacteria have one chromosome, while others have more than one. Bactcrial DN A also exist as plasmids which are circular pieces of DNA that can be transmitted between bacteria. Plasmids often carry the genes for antibiotic resistance and can thus spread between different bacteria. Bacterial chromosomes
If a colony of bacteria is infected with bacteriophages, the bacteria undergo chance collision and ultimately the phages attach to the bacterial cell wall through tail fibres. The DNA of the phage is injected into the host cell by dissolving the cell wall at the point of attachment, and the protein shell remains outside. The
Bacteria Vs. Virus differences (Bacteria characters “Normal” and Virus characters “Bold” for easy understanding) 1. Unicellular 1. Acellular 2. Composed of cell wall. 2. Without cell wall and sometimes envelop may be present. 3. Sometimes bacteriochlorophyll, prokaryotic nucleus present. 3. Composed of any two components- nuclei acid core and protein sheath, Non-nucleated. 4. Cytoplasm present.