| Unlike most amino acids, cysteine and methionine contain ____. |
beta sheet |
| Proteins are linear chains of amino acids joined by ____ bonds. |
cysteine |
| Each of the four subunits of hemoglobin contain one ____ ion. |
iron |
| In some proteins, ____ residues are joined by disulfide bonds. |
peptide |
| A protein's structure can be revealed by ____ crystallography. |
pH |
| The alpha helix and ____ are secondary structures of proteins. |
sulfur |
| Myoglobin has a single chain, whereas hemoglobin is a ____. |
tetramer |
| Temperature and ____ are factors that affect enzyme activity. |
x-ray |
