Sift together flour, sugar, baking soda, baking powder, and salt; cut in the shortening.
Add buttermilk and yeast that has been dissolved in the warm water. Mix with a spoon until all of the flour is moist. Cover the bowl with plastic wrap and put in refrigerator until ready to use.
Preheat oven to 400F. Grease a baking sheet.
Roll out only as much dough as you need on a floured board; dough should be 1/2 to 3/4-inch thick. Cut out biscuits and place on the prepared baking sheet.
Bake approximately 12 minutes or until golden brown.
Notes
Original version - a second version (Angel Biscuits Version 2) is also in the archive. Bake only as much as you need; the dough will keep at least two weeks in the refrigerator.