In RNA of humans adenine pairs with

The correct answer is Uracil

Explanation:

• RNA (Ribonucleic Acid) is a nucleic acid present in all living cells. It is primarily involved in the synthesis of proteins and carries genetic information in some viruses.
• The structure of RNA is similar to DNA but has some differences, including the presence of ribose sugar instead of deoxyribose and the use of uracil instead of thymine.
• In RNA, the nitrogenous bases are adenine A, uracil U, cytosine C, and guanine G.
• In RNA, adenine pairs with uracil through hydrogen bonding.
• This pairing is crucial for the proper transcription and translation processes during protein synthesis.

Other Options:

• Guanine: Guanine pairs with cytosine in RNA, not adenine. This pairing is also essential for the stability and structure of RNA strands.
• Thymine: Thymine is not present in RNA. It is replaced by uracil. Thymine pairs with adenine in DNA, but in RNA, adenine pairs with uracil.