Which of the following is not a DNA nucleobase?

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Multiple Choice

Which of the following is not a DNA nucleobase?

Explanation:
Uracil is not a DNA nucleobase. DNA uses four bases—adenine, cytosine, guanine, and thymine. In RNA, thymine is replaced by uracil, which pairs with adenine. Uracil differs from thymine by lacking a methyl group, a difference that helps distinguish RNA from DNA and plays a role in how cells identify certain DNA damage events. So, since DNA contains thymine rather than uracil, uracil is not a component of DNA.

Uracil is not a DNA nucleobase. DNA uses four bases—adenine, cytosine, guanine, and thymine. In RNA, thymine is replaced by uracil, which pairs with adenine. Uracil differs from thymine by lacking a methyl group, a difference that helps distinguish RNA from DNA and plays a role in how cells identify certain DNA damage events. So, since DNA contains thymine rather than uracil, uracil is not a component of DNA.

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