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. [...]
Bacteria Vs Virus: 1. Unicellular 1. Acellular 2. Composed of cell wall 2. Without cell wall sometimes envelope may be presnet. 3. Sometimes bacteriochlorophyll, prokaryotic nucleus (incipient nucleus nucleoid) present 3. Composed of any two components – nucleic acid core and protein sheath, non-nucleated. 4. Cytoplasm present 4. Cytoplasm absent 5. Genetical material both DNA [...]
Bacteria may be classified according to the presence and absence of flagella as follow with examples- (a) Monotrichous- Presence of one flagellum at one pole, eg. Vibrio. (b) Lophotrichous- Presence of tuft of flagella at one pol, eg. Pseudomonas. (c) Amphitrichous- Presence of tufts of flagella at both ends, eg. Spirillum. (d) Peritrichous- Presence of [...]
