BIOL2142 Lecture Notes - Lecture 3: Chemotaxis, Polyphosphate, Mreb
Document Summary
Movement toward a chemical attractant or away from a chemical repellent. Changing concentrations of chemical attractants and chemical repellents bind to chemoreceptors of chemosensing systems. Tumbling frequency is intermittently reduced and runs in direction of attractor are longer. Behaviour of bacterium is altered by temporal concentration of chemical. Chemotaxis away from repellent involves similar but opposite responses. Homologous of all three eukaryotic cytoskeletal elements have been identified in bacteria. Forms rings during septum formation in cell division. Observed in many bacteria with high respiratory activity. Granules of organic or inorganic material that are stockpiled by the cell for future use. Some lie free in the cytoplasm while others are enclosed by a single-layered membrane. Storage of nutrients, metabolic end products, energy, building blocks. Not bound by membranes by compartmentalised for specific function (has protein shell) Carboxysomes - cyanobacteria and other co2 fixing bacteria. Contain enzyme ribulose-1, 5, -bisphosphate carboxylase (rubisco) for co2 fixation.
