The other aspect of regular yeast breads compared with sourdough is the body's reaction to the starch. (blog.realfood-realhealth.com)
It is not alive like regular yeast you use in bread. (fasttofresh.com)
Because instant yeast is combined with flour, the temperature of the liquid used to activate instant yeast needs to be higher than that used with regular yeast. (healthyflour.com)