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    • TSR Support Team
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    (Original post by realsmilee)
    This is really random..

    But why is a virus a vector?

    I understand a plasmid is a vector because - they are small rings of DNA, easy to modify - and - they are small and can move in and out of bacterial cells easily.

    But, why a virus?..
    My guess would be because viruses seek out cells to penetrate into to reproduce, as this is the only way they can - therefore they can easily pass the new genes into cells I guess? Also they're really small? I'm not sure
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    Does anyone have the mark scheme for the 2015 paper?
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    (Original post by NiamhM1801)
    My guess would be because viruses seek out cells to penetrate into to reproduce, as this is the only way they can - therefore they can easily pass the new genes into cells I guess? Also they're really small? I'm not sure
    Ahhh thank you!

    Do you have any predictions or resources?
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    (Original post by realsmilee)
    Ahhh thank you!

    Do you have any predictions or resources?
    You're welcome
    And I don't have any predictions, however there's a YouTube channel that I think is called Frances Dowle or something, which has videos where they basically make a huge mind map for each sub-topic within a unit - they can be quite helpful
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    This playlist of Youtube videos is good! https://www.youtube.com/watch?v=B5kT...QlfeTuokxDscHW


    (Original post by realsmilee)
    Ahhh thank you!

    Do you have any predictions or resources?
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    (Original post by rebbarn29)
    This playlist of Youtube videos is good! https://www.youtube.com/watch?v=B5kT...QlfeTuokxDscHW
    Thank you!
    And Niamh too

    You guys will do great tomorrow!
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    Can someone please explain how genetic modification is used for making crops herbicide resistant.
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    Thank you! Good Luck tomorrow

    (Original post by realsmilee)
    Thank you!
    And Niamh too

    You guys will do great tomorrow!
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    (Original post by rebbarn29)
    Can someone please explain how genetic modification is used for making crops herbicide resistant.
    -some plants have natural herbicide resistance
    -you can cut out the gene responsible for this and transfer it to a useful plant
    -this gene will then be reproduced in all of the plants cells
    -the new plant will then be herbicide resistant

    In incredibly basic terms
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    (Original post by realsmilee)
    Thank you!
    And Niamh too

    You guys will do great tomorrow!
    Thank you, you will too
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    (Original post by nurfgunlou)
    Does anyone have the mark scheme for the 2015 paper?
    https://smhw-production.s3.amazonaws..._MS_June15.pdf
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    I teach P7 and have made a nuch of videos here here if anyone's interested. Most of P7 covered with more bits and pieces coming this week

    https://www.youtube.com/playlist?lis...XHC7Gz1ZblMMyu
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    Do you have the paper too?
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    Sorry for being so late
    Attached Images
  1. File Type: pdf A163-02-QP-Jun15.pdf (534.1 KB, 86 views)
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    Thanks

    (Original post by NiamhM1801)
    -some plants have natural herbicide resistance
    -you can cut out the gene responsible for this and transfer it to a useful plant
    -this gene will then be reproduced in all of the plants cells
    -the new plant will then be herbicide resistant

    In incredibly basic terms
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    I've just created an OCR 21st Century Science Biology B7 Unnoficial Mark Scheme, feel free to come and suggest and discuss answers. http://www.thestudentroom.co.uk/show...8#post65942928
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    When was most of B7 in that B7 exam?!
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    (Original post by rebbarn29)
    When was most of B7 in that B7 exam?!
    I know, there was a lot of questions on ideas about science.
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    I found it lemon de squeezy.


    ⚔🛡⚔~Nothing happens to anyone that he is not fitted by nature to bear - Maximus Decimus Meridius~⚔🛡⚔
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    (Original post by Mr. Flibble)
    I teach P7 and have made a nuch of videos here here if anyone's interested. Most of P7 covered with more bits and pieces coming this week

    https://www.youtube.com/playlist?lis...XHC7Gz1ZblMMyu
    Thank you so much!!
 
 
 

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