So hopefully this does not seem like too silly a question...but is there anything in a typical small packet of baker's yeast aside from actual yeast organisms (S. cerevisiae)?
I guess that I always assumed that there was some kind of filler agent such as cornstarch mixed in with the yeast in order to give it some "substance". However, when looking at the ingredient list for baker's yeast on multiple manufacturers' websites, yeast is listed as the only ingredient.
I researched further to find that a single yeast organism of the species S. cerevisiae is only approximately 6 microns wide. For comparison, a grain of table salt is something on the order of 500 microns wide. So I am at a loss to understand how I am able to see individual "grains" of yeast.
So one or more of these possibilities seems to be true:
1) There is some kind of filler in the yeast packages that is simply not listed.
2) There is actually nothing but yeast organisms in the package. Even though individual grains seem discernible, this may simply be an optical illusion of sorts or a large number of yeast cells sticking together which appear to be a single grain/cell.
All evidence seems to point to number 2 being true, but I am just trying to determine if I am correct about this. It seems counter-intuitive to me, though, that each packet contains a lump of single-celled organisms with no filler or any kind.
Please enlighten me or point out what I am missing!