Table: amino_acids
Columns: amino_acid
3_letter
1_letter
side_chain_polarity
side_chain_charge_ph_7_4
hydropathy_index

Question: what is the 1-letter for the amino acid asparagine?
SQL: SELECT "1_letter" FROM amino_acids WHERE "amino_acid" = 'asparagine'

Question: what is the side-chain polarity for the amino acid with the 1-letter v?
SQL: SELECT "side_chain_polarity" FROM amino_acids WHERE "1_letter" = 'v'

Question: What is the side-chain charge (ph 7.4) for the amino acid with the 1-letter p?
SQL: SELECT "side_chain_charge_ph_7_4" FROM amino_acids WHERE "1_letter" = 'p'