| Front | do subunits in a protein behave as a single unit? carrying only one function? |
| Back | subunits of oligomeric proteins remain stably associated and behave as single unit with one or several functions. |
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| Front | B sheets and restricted angles |
| Back | The phi and psi values are not restricted to a narrow range but cover the bulk of a highly favorable area on the Ramachandran plot. |
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| Front | Is the iron totally in the plane of the heme group in deoxyhemoglobin? |
| Back | I deoxyhemoglobin, the ferrous iron is conjugated to 5 ligands (4 N atoms and the tetrapyrrole ring imidazole N of His-93). The iron in this case lies slightly (0.4 A) below the plane of the heme group |
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