Adenine is always paired with ................. in RNA molecule.

Explanation

To answer the question "Adenine is always paired with ................. in RNA molecule," we can follow these steps:

1. **Understand the Structure of RNA**: RNA (ribonucleic acid) is a nucleic acid that plays a crucial role in coding, decoding, regulation, and expression of genes. It consists of a sugar (ribose), phosphate group, and nitrogenous bases.

2. **Identify the Nitrogenous Bases**: RNA contains four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and uracil (U). It is important to note that in RNA, uracil replaces thymine, which is found in DNA.

3. **Recognize the Pairing Rules**: In nucleic acids, nitrogenous bases pair with each other through hydrogen bonds. In RNA, the pairing rules are as follows:
- Adenine (A) pairs with Uracil (U)
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