| 1 | Base pairing The bonding relationship between purine and pyrimidine bases in the nucleotides of DNA and RNA. | |
| 2 | Theobromine, like caffeine, and also like the asthma drug theophylline, belong to the chemical group known as xanthine alkaloids. | |
| 3 | So basically the shell is trapping sunlight and the xanthopterin is converting it to energy. | |
| 4 | They also found hypoxanthine and xanthine, which don' t factor in to DNA but are used in other biological functions. | |
| 5 | The yellow sections also contain the pigment xanthopterin tightly packed in granules. Xanthopterin has the ability to change light into electrical energy. |
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