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Question
Which of the following bases is not present in DNA?
Options
Adenine
Thymine
Cytosine
Uracil
MCQ
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Solution
Uracil
Explanation:
Uracil is rarely found in DNA, which could be an evolutionary adaptation to increase genetic stability. This is due to the fact that cytosine can deaminate spontaneously to produce uracil via hydrolytic deamination.
Chemical formula: C4H4N2O2
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