Yeasts are eukaryotic single-celled microorganisms classified as members of the fungus family. Yeast are inactive at low temp, at higher temp their enzymes are denatured.
The growth rate of yeast doubles every 10*C rise in temperature (roughly) This continues until the optimum temperature. – above which the enzymes in yeast become denatured and growth rate slows.
Distillers yeast is propagated aerobically – if yeast is propagated aerobically that means it starts faster, contains sterols, fatty acids. 
Propagated means bred from the parent stock. Aerobically means “relating to oxygen”