Lesson 4 Flashcards
Involves changes in form and function that play a prominent role in the life cycle of the organisn
Prokaryotic Development
Importance of the differentiation of Rhizobium
To increase surface area
Acts as a plant cell surface receptor
Lectins
Acts as a chemoattractant
Flavanoids
Are short, motile filaments lacking heterocysts. Develops response to stimuli
Hormogonia
Site of nitrogenase production in cyanobacteria
Heterocysts
Dormant form of the cyanobacteria
Akinetes
Contains a single flagellum and multiple pili at one cell pole of Caulobacter crescentus
Swarmer cell
The polar flagellum has been replaced with a thin extension of the cell envelope known as
Prostheca or stalk
Nonmotile morphotype of Caulobacter
Stalked cell
Bacterial process that allows cels to move in a coordinated manner and expand the population to new locations of Proteus
Swarming
Requirements of differentiation initiation of Proteus swarmer cells
Contact on solid aurface
Inhibition of flagellar rotation
Sufficient cell density
Cell-cell signaling
Component necessary for the swarming of Proteus
Acidic polysaccharide
Colony migration factor
Referred to as social prokaryotes
Myxobacteria
Helps myxobacteria find bacterial colonies on which to feed
Elasticotaxis
Two major life stages of Myxobacteria
Feeding, growth, division
Development- Fruiting body formation
Conditions of fruiting body formation
Nutrient depletion
Cells on solid surface
Cells at high density
Fates of subpopulation of Myxobacteria
Myxospores (10%)
Peripheral cells (30%)
Cells that undergo programmed cell lysis (60%)
Advantages of fruiting bodies in Myxobacteria
Attract insects aiding dispersal
Bright color pigment protect fruiting bodies from photooxidative damage
Cels on outside protect those on inside from environmental stress
