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QuestionAnatomy and Physiology

Which nitrogenous base is found in RNA but not in DNA, and what is its role in RNA? A) Adenine, which pairs with uracil in RNA. B) Cytosine, which pairs with thymine in RNA. C) Guanine, which pairs with adenine in RNA. D) Uracil, which is one of the four nitrogenous bases in RNA but not found in DNA.
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Step 1
: Identify the nitrogenous base that is found in RNA but not in DNA.

In DNA, the nitrogenous bases are adenine (A), cytosine (C), guanine (G), and thymine (T). In RNA, the nitrogenous bases are adenine (A), cytosine (C), guanine (G), and uracil (U). Notice that uracil is present in RNA but not in DNA.

Step 2
: Explain the role of the identified nitrogenous base in RNA.

Uracil plays a crucial role in RNA as one of its four nitrogenous bases. During transcription, a process that copies a segment of DNA into RNA, uracil pairs with adenine in DNA. This pairing is similar to how cytosine pairs with guanine. The difference is that uracil replaces thymine, which is found in DNA.

Final Answer

Its role in RNA is to pair with adenine during transcription, replacing thymine found in DNA.

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