yes
yes
Certainly, white all purpose flour will work in muffins. Although they might turn out to be cupcakes, rather than muffins.
Yes :)
Flour, all-purpose (plain)substitute: Whole-wheat flour for half of the called-for all-purpose flour in baked goods Note: Whole-wheat pastry flour is less dense and works well in softer products like cakes and muffins. I,ve also heard of almond flour- something to look in to. Go to your local whole foods market, you can always find healthy stuff there
Self-rising Flour
yes enriched flour can be substituted for all purpose flour in a cake
yes
In general, yes.
Flour is the main ingredient in muffins.
All-purpose flour can be used as a substitute for cornstarch.
Generally, you can replace white flour with whole wheat flour of the same type (bread for bread, all purpose for all purpose), substituting one for one. However, products made with whole wheat flour will usually be more dense. This may be helped somewhat by sifting the flour one or two extra times to help incorporate more air. Always remember when using any all purpose flour for items such as muffins and cookies to mix as little as possible to avoid forming glutens, which will toughen the final result.
Whether or not coconut flour can be substituted with all-purpose flour depends on the recipe in question. Coconut flour does not have the protein called gluten that is in all-purpose flour, so their baking characteristics are quite different.