BIO 240 CC Endosymbiotic Theory Case of the Photosynthetic Sea Slug Questions

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Bio 240

Cuyamaca College



Understanding Endosymbiosis: The Photosynthetic Sea Slug

Please click read the article and use to answer the questions below. (Links to an external site.)

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Part 1

Read the Abstract carefully, then the Introduction. Look at the pictures and read the captions. Read the Results. Scan the Methods. Do you need to understand everything? No!!!

Try to figure out the general idea of the paper, what are the authors trying to say? Do you believe them with the data they present?

Part 2

Answer the following questions. Please type your response and submit as a PDF to Canvas:

  1. What are the two hypotheses?
  2. Which of these hypotheses was supported?
  3. What data was used to support this hypothesis?
  4. Why is the sea slug green?
  5. Where did the missing algal DNA go?
  6. How does this research support the theory of endosymbiosis?
  7. Describe how this is a case of lateral gene transfer.
  8. Use the supplemental figure below to describe the origin of the plastid in Elysia chlorotica. What level of endosymbiosis is this? What evidence is there to support this? This image is found in the supplemental information PDF from the paper.

Tertiary Encosymbiosis.png

Your write-up is due Wednesday by midnight. Please write in complete sentence and use your thoughts. Do NOT copy and paste from the article. Put the information in your own words.

You will get a summary of your "plagiarism report" and will have a chance to resubmit if your work is too close to someone else's work.


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Endosymbiotic Theory: The Case of the Photosynthetic Sea Slug Write-Up
Part 1
Rumpho et al. explanations and illustration of the studies based on the survival tactic of the sea
slug Elysia chlorotica are significant since it is greatly based on the facts that are developed from
multiple experiments which have been done and have been approved. The claims and the data
presented by the authors of the article are reliable since they have created and shown how the
symbiotic associations which are related to the genetic transfers have been postulated in a bid to
contribute to the biodiversity significantly and revolutionized innovations. The authors also tend
to bring out the diversity of the complex algae endosymbiosis in the uptaking of the eukaryotic
alga through the heterotrophic eukaryotic host. I believe that the data presented by the authors is
significant to one’s research and readings.
Part 2
The two hypotheses include:
Provision of essential plastid proteins by the mollusk
The capability of the V. litorea plastids to hold genetic autonomy
The first hypothesis was profoundly supported in the article.
The information gathered to support the hypothesis is found in the first paragraph since the
authors state, “we demonstrated that a nuclear gene of oxygenic photosynthesis, psbO, it
expresses in the sea slug and has integrated into the...

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