No single amino acid exclusively "shouldn't" be in an aqueous solution. Amino acids are the building blocks of proteins and are generally stable in water. Their solubility can vary based on the R group; for example, hydrophobic amino acids are less soluble than hydrophilic ones. However, some non-standard amino acids, like selenocysteine (considered the 21st amino acid), have specific conditions under which they are stable. Furthermore, in highly specific laboratory settings or industrial processes, the stability of an amino acid in an aqueous solution might be undesirable due to reactions that could interfere with the desired outcomes. Therefore, it's more about context rather than categorically stating an amino acid shouldn't be in an aqueous solution.

Diamonds are not actually polymers. They are made of carbon atoms linked together in a crystal lattice structure, not repeating units of monomers as seen in polymers. In diamonds, each carbon atom forms four strong covalent bonds with other carbon atoms, creating a highly organized and rigid structure that gives diamonds their hardness. Polymers, on the other hand, consist of long chains or networks of repeating units (monomers) linked by covalent bonds. These materials exhibit a wide range of properties, depending on the nature of the monomers and the structure of the polymer chains, which can be linear, branched, or cross-linked. While both diamonds and polymers involve strong covalent bonding, the similarity ends there, with diamonds being a form of elemental carbon and polymers being large molecules composed of many smaller units.

Hemoglobin, a protein complex in red blood cells, is essential for oxygen transport in vertebrates. It consists of four polypeptide chains: two alpha and two beta chains. The number of amino acids in these chains varies among different species. In humans, each alpha chain comprises 141 amino acids, while each beta chain contains 146 amino wacids, totaling 574 amino acids in the entire hemoglobin molecule. This specific composition and sequence of amino acids are crucial for hemoglobin's functionality, including its ability to bind and release oxygen efficiently. Variations in these amino acid sequences can lead to disorders such as sickle-cell disease and various forms of anemia, highlighting the importance of the precise arrangement of amino acids in hemoglobin's structure and function.