Purine base with methyl substituents occurring in plants are

Caffeine

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Theophylline

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Theobromine

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All of the above

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Solution

The correct option is D All of the above
A number of purine bases containing methyl substituents occur in plants and plant products and many of them have pharmacological properties. For example Theophylline is chemically 1,3-dimethylxanthine. It is found in tea. Theobromine occurs in cocoa. It is chemically 3,7-dimethylxanthine. Caffeine is present in coffee. It is chemically 1,3,7-trimethylxanthine.

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A mutation which substitutes one purine base with another purine base is called as?

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