1. The SDN iPhone App is back and free through November! Get it today and please post a review on the App Store!
    Dismiss Notice
  2. Dismiss Notice
  3. 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
  4. Dismiss Notice
Dismiss Notice

Interview Feedback: Visit Interview Feedback to view and submit interview information.

Interviewing Masterclass: Free masterclass on interviewing from SDN and Medical College of Georgia

solution to sea urchin problem

Discussion in 'DAT Discussions' started by Tigerlili, Jul 19, 2006.

  1. Tigerlili

    Tigerlili Junior Member
    5+ Year Member

    Joined:
    Mar 11, 2006
    Messages:
    21
    Likes Received:
    0
    Status:
    Pre-Health (Field Undecided)
    Hey guys,

    I was wondering what the consensus on the answer for the sea urchin problem was. The question was "why does the sea urchin develop a membrane after fertilization?" is it to prevent polyspermy???

    Thanks!
     
  2. Note: SDN Members do not see this ad.

  3. allstardentist

    allstardentist All-Star
    10+ Year Member

    Joined:
    Apr 27, 2006
    Messages:
    927
    Likes Received:
    1
    Status:
    Dental Student
  4. issa

    issa Senior Member
    5+ Year Member

    Joined:
    Aug 24, 2005
    Messages:
    561
    Likes Received:
    0
    this question is kind of difficult. we didn't cover it in my zoology class. are the rest of the bio questions in the real dat easier than this or not?
     
  5. allstardentist

    allstardentist All-Star
    10+ Year Member

    Joined:
    Apr 27, 2006
    Messages:
    927
    Likes Received:
    1
    Status:
    Dental Student
    should be. but i havent taken it so....
     
  6. rockets32

    rockets32 Junior Member
    2+ Year Member

    Joined:
    Jun 13, 2006
    Messages:
    17
    Likes Received:
    0
    Status:
    Pre-Dental
    I actually had a lab where we did this experiment. After fertilization, we actually saw the sperm come close and bounce away from the membrane :laugh:
     
  7. DMD-2-B

    DMD-2-B Senior Member
    7+ Year Member

    Joined:
    Mar 13, 2005
    Messages:
    223
    Likes Received:
    0
    Well that's kind of a weird question. "Why does the sea urchin develop a membrane after fertilization?" Why is a weird question. It's like saying "Why does an egg undergo cleavage?" It's age-old mystery we'd all like to know - the drive behind life sort of thing.

    However, if the question is "What is the function of the fertilization membrane formed by the sea urchin egg after it is penetrated by one sperm?" the answer would be "To provide a long-term block against polyspermy."
     

Share This Page