1. Guest, be sure to check out How To Get Into Dental School, our free downloadable PDF with step-by-step details for dental school applicants!
    Dismiss Notice
  2. Dismiss Notice

endosymbiotic theory

Discussion in 'DAT Discussions' started by arpitpatel86, Jun 5, 2008.

  1. arpitpatel86

    Joined:
    May 9, 2008
    Messages:
    104
    Likes Received:
    0
    Status:
    Pre-Dental
    did chloroplast and mitochondria descend from prokaryotic autotroph or was mitochondria frmo a eukaryotic heterotroph?

    also earliast cells were anaerobic heterotrophs right? but the earliast organelles such as chloroplast were prokaryotic autotrophs
     
  2. Thread continues after this sponsor message. SDN Members do not see this ad.

  3. DRHOYA

    Joined:
    May 15, 2008
    Messages:
    746
    Likes Received:
    1
    Status:
    Pre-Dental
    The best evidence for this theory is the fact that the mito & chloroplast have double and multiple membranes. Also, the fact that they can produce energy, and carry their own DNA. Since chloroplasts contain photo-pigments in the thylakoid area, they could have stemmed from autotrohpic prokaryotes. Mitochondria most likely stemmed from the primitive heterotrophic prokaryotes due to the fact that they contain novel metabolic pathways such as the krebs cycle enzymes and the ETC. Hope this helps.
     
  4. bumpski20

    Joined:
    Sep 2, 2007
    Messages:
    125
    Likes Received:
    0
    Status:
    Pre-Dental
    1) mito descended from prokaryote, which explains the extreme similarities between mitochondria and bacterial cells (own single circular dna, replicates by binary fission, own ribosomes which sythnethisize some proteins, similar sizes, etc).

    2) yes, earliest cells were anaerobic heterotrophs. i dont no about about the earliest organelles.
     

Share This Page