Answer:
1. The structure is prone to hydrophobic interaction due to the presence of a hydrophobic side chain.
2. The amino acid side chain can form hydrogen bonds due to the presence of hydrogen and nitrogen.
3. It is the primary structure of proteins (polypeptides)
4. With the presence of sulfur in the amino acid, disulfide linkage can be formed.
5. Both structures are Cysteine and histidine side chains of amino acids.
Step-by-step explanation:
Proteins are organic materials. The two structures are the primary structures of the primary protein molecule which is the amino acid. They can be found in both plants and animals as it promotes cellular regeneration of damaged tissues and cell and the development of organs in living things. It is also found naturally in other materials in our enviroment.