Results 1 to 6 of 6
Like Tree3Likes
  • 1 Post By chairs
  • 2 Post By SuperAltastic

Thread: Quick Bio Question

  1. #1
    I love trials pikachu975's Avatar
    Join Date
    May 2015
    HSC
    2017
    Gender
    Male
    Location
    NSW
    Posts
    1,570
    Rep Power
    3

    Quick Bio Question

    Just a quick question, is the light-sensitive pigment in cones in the eye photopsin or iodopsin? This is for the communication option topic and different sources say different things so I just need to clarify. Thanks for any help.
    2016 HSC (Accelerated)
    // 2 Unit Maths // Studies of Religion 1 //

    2017 HSC
    // Biology // Physics // Maths Extension 1 // Maths Extension 2 // English Advanced //

  2. #2
    New Member
    Join Date
    Jun 2014
    HSC
    2014
    Gender
    Male
    Posts
    24
    Rep Power
    3

    Re: Quick Bio Question

    i believe iodopsin is equivalent to rhodopsin and in similarly as in rhodopsin (which when activated, bleaches into opsin and derivative of vitamin A), iodopsin bleaches into photopsin and vit A derivative

    https://www.ncbi.nlm.nih.gov/pubmed/14367777
    pikachu975 likes this.
    ATAR: 99.40


    The Overnight Student by Michael L. Jones - good read

  3. #3
    Cadet SuperAltastic's Avatar
    Join Date
    Jul 2014
    HSC
    2016
    Gender
    Undisclosed
    Posts
    45
    Rep Power
    3

    Re: Quick Bio Question

    Quote Originally Posted by pikachu975 View Post
    Just a quick question, is the light-sensitive pigment in cones in the eye photopsin or iodopsin? This is for the communication option topic and different sources say different things so I just need to clarify. Thanks for any help.
    Rods = Rhodopsin (both begin with R)
    Cones = Iodopsin and there are 3 types red, blue and green.

    That is all that you need to know for that question.
    pikachu975 and vkusno like this.

  4. #4
    I love trials pikachu975's Avatar
    Join Date
    May 2015
    HSC
    2017
    Gender
    Male
    Location
    NSW
    Posts
    1,570
    Rep Power
    3

    Re: Quick Bio Question

    Quote Originally Posted by SuperAltastic View Post
    Rods = Rhodopsin (both begin with R)
    Cones = Iodopsin and there are 3 types red, blue and green.

    That is all that you need to know for that question.
    Would you lose marks for saying photopsin for cones?

    And for a different question:
    http://prntscr.com/dqxoxk

    How would you solve this one? How do you get 22 plants in the end by starting with two? Thanks!
    Last edited by pikachu975; 3 Jan 2017 at 8:59 PM.
    2016 HSC (Accelerated)
    // 2 Unit Maths // Studies of Religion 1 //

    2017 HSC
    // Biology // Physics // Maths Extension 1 // Maths Extension 2 // English Advanced //

  5. #5
    Cadet SuperAltastic's Avatar
    Join Date
    Jul 2014
    HSC
    2016
    Gender
    Undisclosed
    Posts
    45
    Rep Power
    3

    Re: Quick Bio Question

    Quote Originally Posted by pikachu975 View Post
    Would you lose marks for saying photopsin for cones?

    And for a different question:
    http://prntscr.com/dqxoxk

    How would you solve this one? How do you get 22 plants in the end by starting with two? Thanks!
    Read the question carefully it says that those colours are the F2 generation so you have to work backwards with two punnet squares in order to get the parents.

    So the F1 generation would be RY and RY so that an orange colour can be achieved in the F2. Hence the parents will have to be RR and YY so that the F1 is RY and RY hence the answer is C.

    The number of plants is just there to tell you that there is a co-dominant species being produced and naturally there will be more as they have a larger chance of being produces 50% compared to 25% of only yellow or red.

  6. #6
    Cadet SuperAltastic's Avatar
    Join Date
    Jul 2014
    HSC
    2016
    Gender
    Undisclosed
    Posts
    45
    Rep Power
    3

    Re: Quick Bio Question

    And it depends if you would lose a mark for saying photopsin as the marking criteria may differ for each exam.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •