The carbon, oxygen, hydrogen and nitrogen are the key elements in aminoacids as all aminoacids contain amine (NH2) and carboxyl (COOH) as functional groups and R group for every specific aminoacid.
The words "asset" and "liability" are two very common words in accounting. Liabilities are legally binding obligations that are payable to another person or entity. Accounts payable, loans, mortgages, deferred revenue,... come under liabilities.