Thymine is correct it is absent in RNA and iski bagae uracile is present in RNA

Thymine is not a component of RNA. RNA (ribonucleic acid) is a single-stranded molecule that plays a crucial role in protein synthesis and gene expression. It is composed of four different nucleotide building blocks: adenine (A), guanine (G), cytosine (C), and uracil (U). Thymine (T) is found in DNA (deoxyribonucleic acid), the double-stranded molecule that carries genetic information.

Explanation:

1. RNA:
- RNA is a nucleic acid that is involved in various cellular processes, including protein synthesis and gene regulation.
- It is composed of a single strand of nucleotides linked together by phosphodiester bonds.
- The nucleotides in RNA are made up of a sugar molecule (ribose), a phosphate group, and a nitrogenous base.

2. Nucleotides:
- Nucleotides are the building blocks of nucleic acids like RNA and DNA.
- Each nucleotide consists of three components: a sugar molecule, a phosphate group, and a nitrogenous base.
- In RNA, the sugar molecule is ribose, while in DNA, it is deoxyribose.

3. Nitrogenous Bases in RNA:
- The four nitrogenous bases found in RNA are adenine (A), guanine (G), cytosine (C), and uracil (U).
- Adenine forms complementary base pairs with uracil (A-U) during RNA synthesis and RNA-DNA hybridization.
- Guanine forms complementary base pairs with cytosine (G-C) during RNA synthesis and RNA-DNA hybridization.

4. Thymine in DNA:
- Thymine (T) is a nitrogenous base found in DNA.
- In DNA, thymine forms complementary base pairs with adenine (T-A).
- Thymine is not present in RNA, and instead, it is replaced by uracil.

Conclusion:
Thymine (T) is not a component of RNA. It is only found in DNA. RNA contains adenine (A), guanine (G), cytosine (C), and uracil (U) as its four nitrogenous bases.