Final answer:
High-quality proteins are complete in their amino acid profile and have high digestibility.
Step-by-step explanation:
High-quality proteins are characterized by a complete amino acid profile, meaning they provide adequate amounts of all nine essential amino acids. Animal proteins such as meat, fish, eggs, and milk are examples of complete proteins. In contrast, incomplete proteins do not contain adequate amounts of one or more essential amino acids. Plant proteins like grains, nuts, and beans are examples of incomplete proteins.
Furthermore, high-quality proteins have high digestibility, meaning they can be readily broken down and absorbed by the body. This ensures that the amino acids are effectively utilized. Low essential amino acid content and high fat content are not characteristics of high-quality proteins.