Digestion and Absorption of Protein (continued) Free amino acids absorbed by cotransport with Na + . Dipeptides and tripeptides transported by secondary active transport using a H + gradient to transport them into the cytoplasm. Hydrolyzed into free amino acids and then secreted into the blood. Insert fig.
Substitute an equal amount of sour cream for milk in a recipe. Examine the texture of the sour cream. Adjust the level of shortening or butter in the recipe. Reduce the shortening by 1/2 cup for thick or heavy sour cream or 1/3 cup for thin or light sour cream.
You can also use this recipe with nondairy milks, however they will not curdle and thicken in the same way that dairy milks will, though they will still work in a recipe. The second option to substitute for buttermilk is to whisk together 1/2 cup of yogurt or sour cream with 1/2 cup of milk. If you only have Greek-style yogurt on hand, use 1/3 cup yogurt and 2/3 cup milk. This mixture may be slightly thicker than store bought buttermilk, but it has good acidity and a very similar flavor to buttermilk for baking.