Which of the following is not a DNA nitrogenous base?

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Multiple Choice

Which of the following is not a DNA nitrogenous base?

Explanation:
DNA stores its information with four nitrogenous bases: adenine, cytosine, guanine, and thymine. Uracil, on the other hand, is the base that replaces thymine in RNA. That’s why uracil is not considered a DNA nitrogenous base. A subtle but important difference helps maintain DNA integrity: thymine has a methyl group that uracil lacks. This methylated form makes DNA more stable and also lets cellular repair systems distinguish a true uracil (as found in RNA) from a cytosine that has deaminated to uracil. As a result, the bases used in DNA are A, T, C, and G, while RNA uses A, U, C, and G.

DNA stores its information with four nitrogenous bases: adenine, cytosine, guanine, and thymine. Uracil, on the other hand, is the base that replaces thymine in RNA. That’s why uracil is not considered a DNA nitrogenous base. A subtle but important difference helps maintain DNA integrity: thymine has a methyl group that uracil lacks. This methylated form makes DNA more stable and also lets cellular repair systems distinguish a true uracil (as found in RNA) from a cytosine that has deaminated to uracil. As a result, the bases used in DNA are A, T, C, and G, while RNA uses A, U, C, and G.

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