"The key characteristic of lager beer is that it's brewed at low temperatures."
Ah, you sound like a genuine beer drinker! Heh, actually, the yeast plays the most important part of the process. It performs best at various temperatures and adds flavor that influences the final product. It really can make a fine brew into an extraordinary brew!
Ah, I would have to say that after the grains, the yeast has the most effect on the final product. Hops will add flavor, but are not nearly as prominent in the final product.
not only is lager unique, it is extremely unique.
ale ferments at warmer temps and ferments from the top of the keg down. lager ferments and very cold temps and ferments from the bottom up. Ale contains many more vitamins that are natural remedies to hang overs. Lager lacks this.
Interestingly, steam beer(invented in california during the gold rush I believe) is lager beer that is fermented at ale temps. I think it was invented by someone that either a) didn’t know that lager yeast was supposed to ferment at lower temps, or b) knew this but didn’t have access to a cold cellar or to ale yeast so was forced to make do with the mismatch.