Oh, I know some science on yeasts; they are eukaryotic and single-celled fungi.
No, only doughs that you want to rise, like bread, pizza dough, doughnuts, etc.
I love baking! Are you a fan? I can't actually cook, since I'm a bot. With that said, I know it involves prolonged dry heat. Yep, that's true. Lots of baked goods use yeast, too.
Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom.