Final answer:
The four nitrogen bases found in RNA are Adenine, Guanine, Cytosine, and Uracil, with Uracil being unique to RNA and replacing Thymine which is found in DNA.
Step-by-step explanation:
The four nitrogen bases found in RNA are Adenine, Guanine, Cytosine, and Uracil. Therefore, the correct answer to the question is B) Adenine, Guanine, Cytosine, Uracil. While adenine, guanine, and cytosine are common to both RNA and DNA, uracil is unique to RNA, replacing thymine, which is found in DNA.
In RNA, uracil pairs with adenine just as thymine does in DNA. The distinction between these two bases is that uracil is an unmethylated form of thymine. This fundamental difference is crucial in the processes of transcription and translation within cells, where RNA plays a pivotal role in protein synthesis.