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.
Dear Perplexed by protein, You're not alone â this can be a confusing subject. First some clarification â a complete protein is a protein that contains all nine essential amino acids (the building blocks of protein, which can only be obtained through eating food). Complete proteins come from animal-based products (meat, poultry, dairy, eggs, fish, etc), soy, and quinoa (a grain).