microbiomes

endosymbiont theory

big organisms engulfs small organisms resulting in an additional membrane forming around it. If it is not digested, it may form a symbiosis with the host and continue to live and reproduce inside the host organism

primary endosymbiosis

involves the engulfment of a bacterium by another free living organism.

secondary endosymbiosis

occurs when the product of primary endosymbiosis is itself engulfed and retained by another free living eukaryotes

euglena

• flagella

• photosynthetic (chlorosplast)

blepharisma

• cilia

• not photosynthetic

• eat bacteria or each other if no food source

paramecium

• cilia

• not photosynthetic

• food vacuole

Naegleria

• change body forms based on how much food is in the environment

• non-amoeboid body form (flagella) is better suited for movement so is common when food source is absent or scarce

• amoeboid body form is better suited for eating and so is common when food source is present, certain genes/body forms expressed at certain environments

• nutrient levels→ need to get around faster to go longer distances to find food when nutrients decrease

  • amoeboid form very slow compared to flagella

• problem with phylogeny bc of this, not photosnthetic

chlamydomona

• flagella

• photosythetic

stentor

• cilia

• photosynthetic

  • via photosynthetic relationships with algae