Whatever fat you use in your biscuit dough, it keeps the biscuits tender by melting between layers of the flour during cooking and making the biscuits flakey. That's why you don't want to mix it so much that the fat is completely absorbed by the flour. There should still be bits of fat noticable in the dough.
Fats in a cake (typically oil, butter, margarine, shortening, and / or egg yolks) act to add moisture and flavor to a cake.
yes margarine is lighter
Whether you choose to use butter or soft margarine for a cake, all of your cake ingredients should be room temperature. Margarine or butter needs to be room temperature to make it easier to cream. If it is too cold, or too warm, the cake won't rise properly. Creaming the butter with room temperature butter or margarine allows air to incorporate into it properly.
YesA different answer:Butter is a major ingredient in pound cake and the primary source of flavor. Substituting margarine for butter might produce a cake, but it would be an imitation of a pound cake, just as margarine is an inexpensive imitation of butter.
Different cake recipes call for different amounts of margarine, but a basic white cake recipe most usually calls for 1/2 cup of butter.
no you cant
Yes you can.
It is good when you are creaming it with sugar
If you're making the cake outside of Passover, then any margarine would work. If dairy isn't an issue then butter can be used. If it's during Passover, you could try oil but depending on type of cake, it might not work.
yes
use butter flavored Crisco
A high fat cake is a cake that contains high amounts of calories, fats, and sugars. It is usually a cake that includes egg yolks, milk, cream, butter, margarine, lard, shortening / vegetbale shortening, and / or oil.