1. The papers section has been updated with the latest CIE May/June 2015 resources for most of the subjects.

    Click here for more information or to discuss
    Dismiss Notice

AS BIOLOGY

Discussion in 'International A And AS Level' started by Haya24, Oct 1, 2017.

  1. Haya24

    Haya24

    Messages:
    11
    Likes Received:
    1
    Trophy Points:
    3
    Gender:
    Female
    Where is the secondary structure in collagen? Because secondary dtructure is present when there is alpha helix, collagen has no alpha helix but an overall helical structure. In mark schemes its written it has a secondary structure? Should it have quaternary due to presence of 3 polypeptides?
     
  2. XPC Bot

    Sponsored Listings
  3. studyingrobot457

    studyingrobot457

    Messages:
    150
    Likes Received:
    356
    Trophy Points:
    73
    Gender:
    Male
    a triple helix is collagen secondary structure, although I think this is not in the syllabus, you just need to say helix, since all active proteins have secondary structure
     
  4. Haya24

    Haya24

    Messages:
    11
    Likes Received:
    1
    Trophy Points:
    3
    Gender:
    Female
    Is it necessary for a quaternary structure to have tertiaty too?
     
  5. studyingrobot457

    studyingrobot457

    Messages:
    150
    Likes Received:
    356
    Trophy Points:
    73
    Gender:
    Male
    I think so, because a tertiary structure is a subunit whereas a quaternary is a complete unit, it is like Lego bricks i guess :p
     
  6. haider.ali007700

    haider.ali007700

    Messages:
    1
    Likes Received:
    1
    Trophy Points:
    3
    Gender:
    Male
    Do we need to remember the name of scientists in As Biology? For example Singer and Nicolson presented Fluid Mosaic model so do we need to remember their name?
     
  7. Haya24

    Haya24

    Messages:
    11
    Likes Received:
    1
    Trophy Points:
    3
    Gender:
    Female
    No
     
  8. Haya24

    Haya24

    Messages:
    11
    Likes Received:
    1
    Trophy Points:
    3
    Gender:
    Female
    Can anyone explaim how to draw chromosomes in a plan diagram? They appear thread like under the microscope do we have to draw its proper X kinda shape? Theres this P3 question in which a root tip is showing mitosis and we have to show different stages of it
     
  9. Haya24

    Haya24

    Messages:
    11
    Likes Received:
    1
    Trophy Points:
    3
    Gender:
    Female
    What and were are the levels of protein oranization in DNA?
     

Share This Page