a. theobromine b. methylxanthine c. theophylline d. alkaloid 2. Caffeine is one of three naturally occurring compounds known as the __________. a. theobromines b. methylxanthines c. endorphins d. tricyclics 3. Caffeine is chemically related to __________. a. theophylline b. theobromine c. nicotine d. all of these e. theophylline and theobromine only 4. Tea contains ________ as well as caffeine. a. theophylline b. theobromine c..
- a. theobromine b. methylxanthine c. theophylline d. alkaloid 2. Caffeine one of
- Pharmacology