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Description
Flashcards by gina_evans0312, updated more than 1 year ago
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Created by gina_evans0312
almost 12 years ago
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| Question | Answer |
| Quorum Sensing | Allows bacteria to switch between gene expression depending on colony density |
| AutoInducers- Cells Released By | All bacterial cells |
| AutoInducers- Threshold | As population increases, [AI] increases to a threshold that alters gene expression |
| AutoInducers- Why | The genes expressed at each density benefit the colony as a whole |
| Vibrio Fischeri- Genes Activated at HCD | Bioluminesence, hiding the squid in which it lives from predation |
| Vibrio Fischeri- How Does It Work? | Bioluminesence prevents the squid from being seen from below at night |
| Vibrio Fischeri- During The Day | Most bacteria are ejected- the colonies become low density and stop the bioluminescence |
| AutoInducers- Gram +ve Bacteria | Produce peptides (directly encoded by genes) |
| AutoInducers- Gram +ve Species Signalling | Only signal within the species |
| AutoInducers- Gram -ve | Based of Acyl Homoserine Lactones (varies by the R group) |
| Vibrio Fisheri- Lux I | Gene that produces the autoinducer |
| Vibrio Fisheri- LuxR | Cytoplasmic receptor and transcription regulator |
| Quorum Sensing In Gram -ve At HCD | Autoinducers can diffuse through the membrane to a cytoplasmic receptor/transcription factor |
| Quorum Sensing In Gram +ve At HCD- Autoinducer Production | Autoinducer must be transported out of cell & its tail cleaved (usually by the protein transporting it) |
| Quorum Sensing In Gram +ve At HCD- Receptor | Histadine Protein Kinase Receptor |
| Quorum Sensing In Gram +ve At HCD- CDB | Cytoplasmic DNA Binding Regulator is Phosph. with P from histadine one receptor |
| Quorum Sensing In Gram +ve At HCD- DNA Transcription | Done by CBD |
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