How can we help?

You can also find more resources in our Help Center.

8 terms

Bacterial Growth and Love

STUDY
PLAY
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