How many amino acids are there

Answer 1

There are 20 standard amino acids that are commonly found in proteins. These amino acids are the building blocks of proteins and are encoded by the genetic code. In addition to these 20 standard amino acids, there are also a few uncommon amino acids that can be found in specialized proteins or as post-translational modifications. Some of these non-standard amino acids include selenocysteine and pyrrolysine. However, when referring to the standard set used in protein synthesis, the number remains 20.