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Multiple Choice
Which nitrogenous base is found only in RNA?
A
Cytosine
B
Adenine
C
Uracil
D
Thymine
Verified step by step guidance
1
Understand the structure of nucleic acids: DNA and RNA are both nucleic acids that contain nitrogenous bases. DNA contains adenine, thymine, cytosine, and guanine, while RNA contains adenine, uracil, cytosine, and guanine.
Identify the unique base in RNA: RNA has a nitrogenous base that is not found in DNA. This base is uracil, which replaces thymine in RNA.
Compare the bases in DNA and RNA: DNA has thymine, whereas RNA has uracil. This is a key difference between the two types of nucleic acids.
Recognize the role of uracil: Uracil pairs with adenine in RNA, similar to how thymine pairs with adenine in DNA.
Conclude the identification: Based on the comparison, uracil is the nitrogenous base found only in RNA, distinguishing it from DNA.