Create an account
A process in eukaruotic evolution in which a heterotrophic eukaryotic cell engulfed a photosynthetic euk. cell, which survived in a symbiotic relationship inside the heterotrophic cell.
May have originated by sec. endosymbiosis; includes some of the most important photsynthetic organisms on earth.
Cite 4 examples of structural and functional diversity among protists.
-unicellular, colonial, or multicellular
-photoautotrophs, heterotrophs, and mixotrophs
-produce asexually, sexually, or both
-diverse physical forms and adaptations
Summarize the role of endosymbiosis in eukaryotic evolution
strong evidence shows that eukaryotes acquired mitochondria after an early eukaryote first engulfed and then formed an endosymbiotic association with an alpha proteobacterium. Sililarly, chloroplasts in red and green algae appear to have descended from a photsynthetic cyanobacterium that was engulfed by an ancient hetertrophic eukaryote. SEcondaru endosymbiosis also played an important role: Various protist lineages acquired plastids by engulfing unicellular red or green algae.
Why do some biologists describe the mitochondria of diplomonads and parabasalids as "highly reduced?"
Their mitochondria do not have an electron trasnport chain and so cannot funciton in aerobic respiration.
Protists that are surrounded by more than two membranes are evidence of:
a. evolution from mitochondria
b.fusion of plastids
c. origin of the plastids from archaea
d. secondary endosymbiosis
e. budding of the plastids from the nuclear envelope
d. secondary endosymbiosis
Biologists suspect that endosymbiosis gave rise to mitochondria before plastids because:
all eukaryotes have mitochondria (or their remnants) whereas many eularyotes do not have plastids
Which group is incorrectly paired with its description:
a. rhizarians- morphologically diverse group define by dna similarities
b. diatoms- important producers in aquatic communities
c. red algae- acquired plastids by secondary endosymbiosis
d. apicomplexans- parasites with intricate life cycles
e. diplomonads- protists with modified mitochondria
red algae did not acquire plastids by secondary endosymbiosis
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together