Final answer:
Amino acids are organic compounds critical for forming proteins with diverse roles in biological processes. They contain an amine and a carboxyl group and differ by their side chains, which determine their properties and function. Humans can synthesize some amino acids, while others must be obtained through diet.
Step-by-step explanation:
Amino acids are organic compounds that are the molecular building blocks of proteins. Each amino acid contains an amine group (-NHâ‚‚), a carboxyl group (-COOH), and a unique side chain (known as the R group) attached to its alpha (a) carbon. These compounds play vital roles in nearly every biochemical process, and the 20 common amino acids are found in the proteins of all living organisms.
Proteins, which are constructed from amino acids, serve numerous essential functions within the cell. The variable R group on each amino acid determines its unique properties and helps define whether the amino acid is nonpolar, polar but uncharged, or charged. For example, asparagine is one amino acid with an uncharged polar side chain.
While humans can synthesize certain amino acids, known as nonessential amino acids, we must obtain others from our diet, and these are called essential amino acids. Nonessential amino acids include alanine, asparagine, and serine, among others. Asparagine itself plays a key role in cellular functions such as signaling and regulation of gene expression.