Which of the following is not present in RNA?

Explanation

RNA (Ribonucleic acid) is a type of genetic material that plays an important role in protein synthesis in cells. It is made up of nucleotides, which are the building blocks of RNA. Each nucleotide contains a sugar, a phosphate group and a nitrogenous base. The four nitrogenous bases found in RNA are Adenine (A), Guanine (G), Cytosine (C) and Uracil (U). The question is asking which of the nitrogenous bases is not present in RNA. The correct answer is option D, Thymine (T). Thymine is only found in DNA (Deoxyribonucleic acid), which is another type of genetic material found in cells. RNA uses Uracil instead of Thymine. Therefore, the correct answer to the question is option D, Thymine. It is important to note that Adenine, Guanine and Cytosine are present in both DNA and RNA, while Thymine is only found in DNA.