Match each level of protein structure with the bonds that define folding at this level. 1. primary structure: 2. secondary structure: 3. tertiary structyre: 4. quaternary structure:

### 1. peptide bonds 2. hydrogen bonds 3. bonds between side chains 4. bonds between multiple polypeptide chains

## Step1: Identifying Primary Structure### The primary structure of a protein refers to the sequence of amino acids that make up the protein. This sequence is determined by the peptide bonds between the amino acids.## Step2: Identifying Secondary Structure### The secondary structure of a protein refers to the local folding of the protein chain into structures such as alpha helices and beta sheets. This folding is stabilized by hydrogen bonds between the backbone atoms of the amino acids.## Step3: Identifying Tertiary Structure### The tertiary structure of a protein refers to the overall three-dimensional shape of the protein. This structure is stabilized by bonds between side chains of the amino acids, including hydrogen bonds, ionic bonds, and disulfide bridges.## Step4: Identifying Quaternary Structure### The quaternary structure of a protein refers to the assembly of multiple polypeptide chains into a single functional unit. This structure is stabilized by bonds between the multiple polypeptide chains, including hydrogen bonds and hydrophobic interactions.