Which is the predominant tautomeric form of adenine when it is present in DNA? 
Definitions:
Mobile Device Operating System
The operating system that runs on mobile devices such as smartphones and tablets, managing both hardware and software.
SIM Card
Short for Subscriber Identity Module, a removable smart card used in mobile phones and some other devices, storing user’s subscription information and phonebook data.
IMSI
International Mobile Subscriber Identity, a unique number associated with all cellular networks mobile phone users that helps in identifying the network to which the mobile phone belongs.
Phone Services
Various telecommunications services provided by carriers, including voice calls, text messaging, and internet access, through mobile or landline phones.
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