Microbiology 2 Flashcards
1
Q
Give a thorough description of symbiosis
A
- Symbiosis results in a unique or novel metabolism and structure(s), which are not present prior to the symbiosis
- Each are so continuously intimate from generation to generation that their recognition, infection, and regulation systems would of necessity have to involve very selective co-evolution
- The process involves an acquisition – whether ancient and/or each generation, i.e., one organism acquires one or more different organisms, and there is enough of a selective advantage that they are maintained through natural selection
- Doesn’t include mutualism!!!
2
Q
List all types of interactions between organisms in the same environment
A
- Mutualistic
- Commensal
- Neutral
- Competitive
- Parasitic
3
Q
Give a example of microbial symbiosis
A
- Intracellular endosymbiosis, with perialgal vacuole.
- Each ciliate hosts 600-1000 Chlorella cells
- Only certain strains of Chlorella are accepted – others are digested inside the vacuole
- The host feeds on bacteria and there is bidirectional transport of food and nutrients
4
Q
Give all major types of symbiotic interactions
A
- Ectosymbiosis
- Endosymbiosis - Extracellular/Intracellular
5
Q
Describe the vertebrate gut microbiome
A
-Lowest level of integration and co-selection -
Ectosymbiosis
-Good example is the rumen/non-rumen mammals
