Personal Statement - Capitalising first letter of subject?

This is probably just pedantry on my part, but is there a correct/conventional way to type the name of your subject - i.e. should I be writing "biology" or "Biology"?

I realised I was being inconsistent with this so went through my personal statement converting them all to the same format... and then realised I didn't know which format was right (or, indeed, whether it mattered).

http://www.informatics.sussex.ac.uk/department/docs/punctuation/node27.html

plus i don't know why you didn't just research it yourself

I've found other websites that say capitalise it only when referring to a specific course, but not when referring to a general field of study (along the lines of what Excalibur said). Websites contradict each other. And I know people contradict each other too, but at least you can interact with people

Anyway, cheers everyone who's replied -and pudlump, I'd go with mathematics personally.

what about for Architecture? My natural impulse is to capitalise, especially when I write Architect as that is a title. Anyone know if that's right?

I would think it wouldn't matter too much, as long as you consistently use one form or the other.