Which of these amino acids, first isolated from gelatin, is the simplest?tryptophanglycinealaninetyrosine

The amino acid that is first isolated from gelatin and is also the simplest among the listed options is glycine.

Explanation:

1. Amino Acid Structure: Amino acids have a general structure comprising an amino group (-NH2), a carboxyl group (-COOH), and a side chain (R group) that varies among different amino acids.

2. Simplicity of Glycine: Glycine (chemical formula: NH2CH2COOH) has the simplest side chain, which is a single hydrogen atom. In contrast:

   • Alanine has a methyl group (-CH3) as its side chain.
   • Tyrosine has a more complex side chain consisting of a phenolic group.
   • Tryptophan has an indole ring in its side chain, making it even more complex.

Thus, glycine stands out as the simplest amino acid due to its straightforward structure and minimal side chain.