Ok, so i'm doing a lab right now to see how the amounts of sugar affect yeast activity. We have equal amounts of water and yeast in 5 test tubes. Each of the 5 test tubes get diff amounts of sugar: one with no sugar, one with 1 g, and another with 2 g, and another with 4 g, and the last one having 8 g. I understand that the yeast in the tubes with sugar went thru cellular resp so that's why it gave off co2. But the one with no sugar still produced 21 mm of bubbles. Why did that happen? Isn't it impossible to go thru cellular resp without glucose? Did it produce co2/o2 in another way? Also, we used sink water instead of distilled water so i'm not sure if that matters or not.
