12th Zoology

Bacteria Structure Culture

Bacteria Structure

The structure, size and arrangement of bacterial cells consitute their
morphology. (Bacteria Structure)

The various morphological features are
1. They are spherical or rod like or spiral shaped.
2. The arrangement of cells in pairs, clusters, chains, trichomes and filaments
etc.
3. The appendages are visible by special staining techniques or by electron
microscopy. (Bacteria Structure)

The above three features represent the gross morphological
characteristics, which are of taxonomic importance in bacterial species
identification. In addition, the bacterial cells possess elaborate internal
structures, which constitute microbial cytology and bacterial anatomy. (Bacteria Structure)

Bacterial Culture

All bacteria need nutrients for their growth. They need a nutrient
medium for their growth and culture. A bacteriological medium is composed Bacterial transformation is a process in which cell free or naked DNA
containing the genetic information is transferred from one bacterial cell to
another. It was discovered by an English health officer, Griffith in 1928. The
transforming principle was identified as DNA by Avery Macleod and Mc
Carthy in 1944.

In transduction, a bacteriophages acts as a vector, transfering a portion
of DNA from one bacterium (donor) to another (recepient). If all fragments
of bacterial DNA have a chance to enter a transducing phage, the
process is called Generalized transduction. On the contrary if a few restricted
genes of the bacterial chromosomes are transduced by bacteriophage,
it is called specialized transduction.

Related Topics in Zoology:

Bio Zoology All Important Topics


  1. Microbiology Introduction and History of Medical Microbiology

  2. Pasteur, Koch, Lister

  3. Structure of Viruses

  4. Viral genetics

  5. Virus Culture

  6. Viral Diseases

  7. Bacteria Structure Culture

  8. Bacterial Genetics

  9. Bacterial Diseases

  10. Protozoan microbiology

  11. Pathogenecity of Microorganisms

  12. Antimicrobial Resistance

  13. Antibiotics and Chemotherapy

  14. AIDS – HIV

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