Combine water, buttermilk, sugar, salt, baking powder, baking soda, and shortening in Mix n Blend II mixing bowl. Select bread cycle.
While mixer is operating, add 2½ cups flour; continue mixing for additional 30 seconds. Add yeast, and lock lid on bowl. Gradually add remaining flour until dough clings to dough hooks and stops sticking to sides of mixing bowl. This mixing process should last 3–4 minutes. Press "Auto Knead" button.
Preheat oven to 400°F. Roll out on lightly floured surface or shape into balls (biscuits do not need to rise). Brush tops of biscuits with melted butter. Bake for 15–20 minutes.