Which nitrogenous base is unique to RNA and not found in DNA?

Which nitrogenous base is unique to RNA and not found in DNA?

• A. Deoxyribose
• B. Ribose
• C. Uracil
• D. Cytosine

Answer: (C)

Uracil is the nitrogenous base that is unique to RNA and is not found in DNA. In RNA, uracil serves as a replacement for thymine, which is the nitrogenous base present in DNA. While both RNA and DNA contain cytosine and guanine, RNA specifically replaces thymine with uracil, which helps differentiate the structure and function of RNA from DNA. In addition to uracil, RNA also contains ribose as its sugar component, whereas DNA contains deoxyribose. The presence of ribose and uracil is crucial for RNA's functionality, particularly in processes like protein synthesis and gene regulation. Thus, uracil stands out as the specific nitrogenous base that defines RNA molecules in comparison to DNA.

Uracil is the nitrogenous base that is unique to RNA and is not found in DNA. In RNA, uracil serves as a replacement for thymine, which is the nitrogenous base present in DNA. While both RNA and DNA contain cytosine and guanine, RNA specifically replaces thymine with uracil, which helps differentiate the structure and function of RNA from DNA.

In addition to uracil, RNA also contains ribose as its sugar component, whereas DNA contains deoxyribose. The presence of ribose and uracil is crucial for RNA's functionality, particularly in processes like protein synthesis and gene regulation. Thus, uracil stands out as the specific nitrogenous base that defines RNA molecules in comparison to DNA.