BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Uracil is the nitrogenous base present only in RNA, but not in DNA. Thymine is in DNA. DNA have thymine, guanine, adenine and cytosine.

Detailed explanation-2: -Uracil is present in RNA but not in DNA.

Detailed explanation-3: -One of the most important differences between DNA and RNA apart from the sugar molecule is the nitrogenous base Uracil, which is seen only in RNA. Instead of Uracil, DNA has Thymine, while the other three nitrogenous bases (Adenine, Guanine, Cytosine) are the same in both RNA and DNA.

Detailed explanation-4: -An RNA molecule has a backbone made of alternating phosphate groups and the sugar ribose, rather than the deoxyribose found in DNA. Attached to each sugar is one of four bases: adenine (A), uracil (U), cytosine (C) or guanine (G).

Detailed explanation-5: -Uracil. The fact that uracil is present in RNA and not DNA contributes to the ability of RNA to be degraded easily. This allows the cell to change which genes are being expressed, as the older RNAs do not stick around for very long.