What is the longest amino acid?
Titin
Titin is the third most abundant protein in muscle (after myosin and actin), and an adult human contains approximately 0.5kg of titin.[8] With its length of ~27,000 to ~33,000 amino acids (depending on the splice isoform), titin is the largest known protein.[9] Furthermore, the gene for titin contains the largest number of exons (363) discovered in any single gene,[10] as well as the longest single exon (17,106 bp).
Longest words
Systematic names of chemical compounds can run to hundreds of thousands of characters in length. The rules of creation of such names are commonly defined by international bodies, therefore they formally belong to many languages. The longest recognized systematic name is for the protein titin, at 189,819 letters.[1] While lexicographers regard generic names of chemical compounds as verbal formulae rather than words,[2] for its sheer length the systematic name for titin is often included in longest-word lists.