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				| 1. | What is the chemical formula of chlorophyll a? | 
| A. | C<sub>45</sub>H<sub>72</sub>MgN<sub>4</sub>O<sub>5</sub> | 
| B. | C<sub>55</sub>H<sub>72</sub>MgN<sub>4</sub>O<sub>5</sub> | 
| C. | C<sub>55</sub>H<sub>72</sub>MnN<sub>4</sub>O<sub>5</sub> | 
| D. | C<sub>45</sub>H<sub>72</sub>MnN<sub>4</sub>O<sub>5</sub> | 
| Answer» C. C<sub>55</sub>H<sub>72</sub>MnN<sub>4</sub>O<sub>5</sub> | |