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this thread is created to discuss all the biology paper 1 questions that you find difficult so we can discuss together and help each other. Hopefully we will be able to learn something and get a*** 
Thanks for opening this separate thread :')
check it out https://www.xtremepapers.com/community/threads/anyone-taking-as-biology-p34.26958/
Im taking p34 and I've posted some of my tips in this thread
I did check it out Not "that" of a help but still it was helpful 
look C is the correct choice because in D suddenly alll traces of the previous nitrogen are gone totally but according to the semi-conservative theory thingy all part of the first DNA will be contributed to the daughter DNA too.... so even if it has a little trace of the N15 they will be passed on even if it is just the most minimal amount.... so the graph wil not touch the x axis i think bcz there will always b a tiniest of atom or molecule or a teeeny tiny fraction of the N15 left in there.
18. Substance X replaces chromosome telomeres which promote DNA replication. Normally, telomeres are not completely replaced during mitosis. Abnormally, substance X is added & it replaces telomeres. That means DNA replication is promoted. DNA replication will cause continual cell division. Substance X is not completely replaced; after each division, it becomes less and less and finally isn't there at all. That means DNA replication becomes less and less, and eventually stops.
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