Question

DNA and RNA differ by

• A. Nitrogen bases and sugars
• B. Nitrogen bases and phosphate groups
• C. Number of C-atoms in sugars
• D. Sugar and phosphate groups

Answer 1

Answer: (A)

• A nucleotide has three components-a nitrogenous base, a pentose sugar (ribose in case of RNA, and deoxyribose for DNA), and a phosphate group
• There are two types of nitrogenous bases-Purines (Adenine and Guanine), and Pyrimidines (Cytosine, Uracil and Thymine)
• Cytosine is common for both DNA and RNA and Thymine is present in DNA
• Uracil is present in RNA at the place of Thymine