1. Hey Guest! Check out the 3 MCAT Study Plan Options listed in the 'stickies' area at the top of the forums (BoomBoom, SN2ed, and MCATJelly). Let us know which you like best.

    Also, we now offer a MCAT Test-Prep Exhibitions Forum where you can ask questions directly from the test-prep services.
    Dismiss Notice
  2. Dismiss Notice
  3. Download free Tapatalk for iPhone or Tapatalk for Android for your phone and follow the SDN forums with push notifications.
    Dismiss Notice
Dismiss Notice
Visit Interview Feedback to view and submit interview information.

Nucleic acid question...

Discussion in 'MCAT Discussions' started by Esteban, Jul 30, 2006.

  1. Esteban

    Esteban Senior Member
    10+ Year Member

    Joined:
    Apr 13, 2006
    Messages:
    764
    Likes Received:
    3
    Status:
    Medical Student
    I have a question- it may seem stupid to some. I am reading EK's biology, and something doesn't make sense to me. It reads,

    "a nucleotide attached to the number 3 carbon (3') of its neighbor, follows that neighbor in the list. In other words, nucleotides are written 5' --> 3'."

    What're they referring to when they say "5'"? Thanks.
     
  2. Note: SDN Members do not see this ad.

  3. geno2568

    geno2568 Senior Member
    2+ Year Member

    Joined:
    Apr 16, 2006
    Messages:
    408
    Likes Received:
    0
    Status:
    Pre-Medical
    they mean the 5' carbon. When you draw a ribose molecule, each carbon has a number. The 5' end of a nucleic acid is the end that has a 5' carbon exposed
     
  4. Sol Rosenberg

    Sol Rosenberg Long Live the New Flesh!
    Physician 10+ Year Member

    Joined:
    Feb 11, 2006
    Messages:
    3,534
    Likes Received:
    7
    Status:
    Attending Physician
    Minor nit. The 5' end has a phosphate (attached to the 5' carbon) exposed.
     
  5. TMP-SMX

    TMP-SMX Senior Member
    Moderator Emeritus Gold Donor Classifieds Approved 10+ Year Member

    Joined:
    Jun 12, 2006
    Messages:
    3,620
    Likes Received:
    70
    Status:
    Attending Physician
    Yes... And if you are confused as to what 3' and 5' are on the deoxyribose just think about the phosphate 5' and the definition of deoxyribose meaning the hydroxyl 3' right next to the "deoxy" 2' hydrogen is what receives the next nucleotide.
     
  6. Esteban

    Esteban Senior Member
    10+ Year Member

    Joined:
    Apr 13, 2006
    Messages:
    764
    Likes Received:
    3
    Status:
    Medical Student
    Thanks! I guess I was tired when I was reviewing this :rolleyes:.
     

Share This Page