NEET BIOLOGY

Detailed explanation-1: -Uracil is unique in RNA. It is not found in DNA.

Detailed explanation-2: -So, a phosphate group, cytosine, guanine, and thymine, are all found in DNA. Thus, ribose sugar is present in RNA, not in DNA.

Detailed explanation-3: -Uracil is only found in RNA, and is absent from DNA.

Detailed explanation-4: -The four bases of DNA are adenine, thymine, cytosine, and guanine, abbreviated A, T, C, and G respectively. In RNA, the base thymine is not found and is instead replaced by a different base called uracil, abbreviated U. The other three bases are present in both DNA and RNA.

Detailed explanation-5: -DNA contains deoxyribose as the sugar component and RNA contains the sugar ribose. Polynucleotides are formed by covalent linkages between the phosphate of one nucleotide and the sugar of another, resulting in phosphodiester linkages.