The 3-dimensional structure of a protein polypeptide chain or chains may be locked in place by other stronger bonds. These bonds are formed between components of the -R groups of the amino acid residues. Create a chart to list and describe these ""stronger interactions"".

NH2 group combines with COOH group to form CONH group after releasing water  

Explanation:

A peptide bond is formed between two R groups of amino acids by eliminating a molecule of water. If two amino acid joins, then a dipeptide link is formed. When three amino acid joins, then a tripeptide link is formed. And in case when many amino acid joins, then a polypeptide link is formed. A protein chain usually has several amino acid residues ranging from 50 to 2000 in numbers. Since a polypeptide chain is formed after the removal of water , it is known as amino acid residues.  

Generally , NH2 group combines with COOH group to form CONH group after releasing water  

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus