LIFE SCIENCE

Detailed explanation-1: -Four different types of nitrogenous bases are found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). In RNA, the thymine is replaced by uracil (U).

Detailed explanation-2: -Answer and Explanation: The correct answer is (b): uracil. DNA contains four bases which are adenine, guanine, thymine, and cytosine. Uracil is the nucleotide that is found in RNA instead of thymine.

Detailed explanation-3: -Uracil is not found in DNA as it uracil has more base pair affinity to adenine, guanine and cytosine. Instead thymine is present in DNA.

Detailed explanation-4: -Abstract. Uracil is one of four nitrogen bases, most frequently found in normal RNA. Uracyl can be found also in DNA as a result of enzymatic or non-enzymatic deamination of cytosine as well as misincorporation of dUMP instead of dTMP during DNA replication.