2006-12-12 01:30:38 · 5 answers · asked by jessica_stay 1 in Science & Mathematics ➔ Biology
When yeast respires it releases CO2 (carbon dioxide) which causes bread to rise and also accounts for the holes (due to CO2) you find in bread.
2006-12-12 01:32:43 · answer #1 · answered by Anonymous · 0⤊ 0⤋
yeast is a micro-organism that like any person likes to eat! In the case of yeast though, they like to eat sugars, such as glucose and carbohydrates. As you probably know, there are a lot of carbohydrates in bread.
Also like us, yeast can go through aerobic respiration to break down the food they eat, and like us, they release CO2 gas.
Before the dough is put in the oven, the yeast have been in there eating and releasing CO2 for a while, making very tiny pockets of CO2. When the bread is heated, it kills the yeast, and heats up the CO2 pockets, causing them to expand like hot air balloons, pushing the bread up and out into a loaf!
2006-12-12 01:37:56 · answer #2 · answered by George B 3 · 1⤊ 0⤋
What is blilogy? Did you run it through the spell-check? My one does not recognise it.
2006-12-12 01:33:39 · answer #3 · answered by Tony B 6 · 0⤊ 0⤋
that the yeast has been activated
2006-12-12 01:32:55 · answer #4 · answered by Jamie 2 · 0⤊ 0⤋
it's alive!!
2006-12-12 01:32:05 · answer #5 · answered by frogonalog 2 · 0⤊ 0⤋