There are slight differences in the meanings of these terms, but they are often used interchangeably. 1  Independent Variable: It implies causality: the independent variable affects the dependent variable. 2  Used predominantly in ANOVA, but often in regression as well. 3  It can be either continuous or categorical.
Protein Quality. Collagen is not a complete protein because it is lacking in the amino acid tryptophan. A Protein Digestibility Corrected Amino Acid Score (PDCAA) of a complete protein is 1.0.ollagen is a protein found in the muscle and connective tissue of animals. Hydrolyzed collagen protein supplements are typically made from the bones and skin of cows, horses or pigs.
How to Combine Food to Make Complete Protein. Many people may be wondering what a complete protein is â especially those following a vegetarian or vegan diet. A complete protein is a source of protein containing all nine of the essential amino acids the body cannot produce adequately. Most people can consume adequate amounts of complete protein without an issue. But for those who are vegetarian or vegan, complete proteins play an important role in their diet and health.