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Hi everyone, hemorrhoid also known as piles is very much painful and this is caused when tissues gets enlarge, or it becomes weak etc. The tissues gets swollen that contain veins and forms hemorrhoid. This is very much critical situation as the pain is not bearable and it should be cured as soon as possible.
Answers. Best Answer: The spontaneous isomerization of a nitrogen base to an alternative hydrogen-bonding form, possibly resulting in a mutation. Reversible shifts of proton position in a molecule. Bases in nucleic acids shift between keto and enol forms or between amino and imino forms. Base substitutions are generally caused by changes in the way that nucleotides base pair. One way this occurs is through tautomeric shifts.