1. 1 cells can use gas vesiclesto rise or fall in the water column
  2. 2 or magnetosomes toorient in a magnetic field
  3. 3 they sense their environment withmembrane-embedded chemoreceptors
  4. +4 ...detecting changes in light,oxygen, and other chemicals
  5. 5 they may also assess their internalstate with cytoplasmic receptors
  6. flagellumarchaellumT4P6 receptors then send signals todirect the motility machinery

Summary

Concept Check Questions

• What is the lattice arrangement of chemoreceptors in a sensory array?

• Which proteins make up the baseplate of a chemosensory array?

• What happens to the flagellar motor when a response regulator binds?

• What cytoskeletal element organizes magnetosomes into a chain?

Further Reading

• Berg (1988). A physicist looks at bacterial chemotaxis [50].

• Hazelbauer et al. (2008). Bacterial chemoreceptors: High-performance signaling in networked arrays [71].

• Lower and Bazylinski (2013). The bacterial magnetosome: A unique prokaryotic organelle [72].

• Schuergers et al. (2016). Cyanobacteria use micro-optics to sense light direction [73].