AP BIOLOGY

Detailed explanation-1: -Properties. In RNA, uracil base-pairs with adenine and replaces thymine during DNA transcription. Methylation of uracil produces thymine. In DNA, the evolutionary substitution of thymine for uracil may have increased DNA stability and improved the efficiency of DNA replication (discussed below).

Detailed explanation-2: -Uracil is a common and naturally occurring pyrimidine nucleobase in which the pyrimidine ring is substituted with two oxo groups at positions 2 and 4. Found in RNA, it base pairs with adenine and replaces thymine during DNA transcription.

Detailed explanation-3: -Function of Uracil Uracil is a building block used to synthesize nucleotides for RNA, which is used in cells to carry genetic information and synthesize proteins.

Detailed explanation-4: -Ribonucleic acid (abbreviated RNA) is a nucleic acid present in all living cells that has structural similarities to DNA. Unlike DNA, however, RNA is most often single-stranded. An RNA molecule has a backbone made of alternating phosphate groups and the sugar ribose, rather than the deoxyribose found in DNA.

Detailed explanation-5: -DNA polynucleotide contains thymine but RNA polynucleotide contains uracil.