Not gonna lie I thought this was meant to be a fight between Biology and Chemistry and a relevance to medecine not an arguement over which is hardest or a general 'pissing' contest - pardon my french.
As far as I'm concerned Universities can ask for whatever they want to ask for whatever they like it's their descision and at the end of the day you can choose where you go and work around some of the requirements.
But inn terms of what is more relevant, Primarily you need what they are asking for.
Plus they teach you most of what you need to learn at university, so what you've learnt previously in any subject, for any course could, somewhat, become unused or forgotten.
Especially as you specialise in one subject at university, there will be things that become less relevant during the progression of the course.
Just thought I'd add another point of view to the pot :3