Bacterial Growth and Love
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8 terms
English | Photos |
|---|---|
 Bacterial Growth-Lag -log -stationary -death |  Lag: metabolic activity without division Log: rapid cell division Stationary: nutrient depletion slows growth Death: prolonged nutrient depletion and build up of waste products |
| Bacterial Sex | 1)Transformation 2)Conjugation 3)Transposition 4)Tranduction -generalized -specialized |
| Transformation | What: ability to take up DNA from the environment Who: SHiN (S.pneumonia, H.influenzae, Neisseria) |
| Conjugation -2types | Two Types: 1)F+ x F-: F+ plasmid transfers to F- ***only plasmid DNA is transferred 2)Hfr x F-: F+ plasmid can become incorporated into bacterial chromosomal DNA(Hfr cell) ***transfer of plasmid may include some flanking chromosomal DNA |
| Transposition | What: segment of DNA that can jump from one location to another So: Genes can be transferred from chrom to plasma and vice versa |
| Transduction -generalized | Generalized ("packaging event"): -Lytic phage infects bacterium leading to cleavage of bacterial DNA and synthesis of viral proteins ***Parts of bacterial DNA may become packaged in viral capsule and transferred to next bacteria that phage infects |
| Transduction -specialized | Specialized("excision event") 1)Lysogenic phage infects bacterium and incorporates viral DNA into bacterial chromosome 2)When phae DNA is excised, flanking bacterial genes may be excised with it 3)DNA is packaged into phage viral capsid and can infect another bacterium |
| Bacterial genes that have undergone Specialized tranduction | ABCDE 1)shigA-like toxin 2)Botulinum toxin 3)Cholera toxin 4)Diptheria toxin 5)Erythrogenic toxin of Strep pyogenes |
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