Which term is used to describe the amino acids which cannot be synthesized by the cell but must be acquired from an outside source?

Essential amino acids

Explanation:

Some amino acids cannot be produced in our body instead they are extracted from the external food sources which are known as essential amino acids Food consumed ,provides essential amino acids. During digestion food is broken down into simple substance and protein within it is digested. Once the protein is digested, essential amino acids are extracted. In totality, there are 9 essential amino acids.