pul water from foods 3) The most important use of proteins from the diet is as a source A) cholesterol for cell membranes. B) carbon skeletons to build fats. C) amino acids to build body proteins. D) energy 35) Glycogen is a that functions in our bodies as A) carbohydrate... a short term energy reserve B) protein... reservoir of spare amino acids C) lipid... a long term energy reserve D) carbohydrate... structural component of cells 36) Which protein source usually has sufficient amounts of all essential amino acids in the needed proportions A) Any single source of animal protein, for example, beef, chicken, milk B) Any single source of plant protein, for example soy, rice, com, lentils. C) Either A or B. D) Neither A nor B