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Which nitrogenous base is not found in ?
A
Cytosine
B
Adenine
C
Thymine
D
Uracil
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1
Understand the structure of DNA: DNA is composed of nucleotides, each containing a phosphate group, a sugar molecule (deoxyribose), and a nitrogenous base.
Identify the nitrogenous bases found in DNA: The four nitrogenous bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).
Recognize the nitrogenous bases found in RNA: RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G).
Compare the bases in DNA and RNA: Notice that uracil is present in RNA but not in DNA, whereas thymine is present in DNA but not in RNA.
Conclude which base is not found in DNA: Based on the comparison, uracil is the nitrogenous base that is not found in DNA.