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    Hi, I'm studying for my BY1 exam and was just wondering if anyone knew if we have to be able to draw a diagram of Guanine, Cytosine, Adenine and Thymine for the exam or just recognise them?
    Any replies asap would be great
    Thank you!
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    I think we just need to recognise what pair together, so U+A in RNA, A+T in DNA, and G+C and then be able to work out which one is which due to percentage composition of the bases we're already given because the bases are proportional and always the same percentage (if it isnt the same percentage then its due to procedural or experimental error).

    Hope this helps
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    Check past papers.


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    I'm also on WJEC, I think you only need to recognise the pairs and the fact that one is slightly longer than it's pair so they don't form two long pairs etc. You do need to able to draw a nucleic acid though.
 
 
 
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