- byjus.com/neet-questions/why-does-dna-contain-thymine-and-rna-uracil says Uracil cannot be repaired by DNA repair mechanisms. But it is also requires less energy to synthesize with.
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Uracil is a pyrimidine nucleotide base with two carbonyl groups. It is common in RNA and ordinarily pairs with adenine.
It lacks the methyl substituent present in thymine. Its ribose nucleoside is uridine; phosphate-bearing derivatives then participate as nucleotides in RNA synthesis and other metabolic processes.