BIOMOLECULES AND ENZYMES

Detailed explanation-1: -DNA is composed of repeating units called nucelotides or nucleotide bases.

Detailed explanation-2: -The basic repeating unit of nucleic acids are known as nucleotides. A nucleotide consists of three distinct chemical groups, a 5-carbon sugar (ribose or deoxyribose), a nitrogen-rich base-(cytosine (C), guanine (G), adenine (A), thymine (T) in DNA or uracil (U) instead of T (in RNA), and phosphate.

Detailed explanation-3: -RNA is a molecule that is chemically similar to DNA, and also contains repeating nucleotide subunits. However, the “bases” of RNA differ from those of DNA in that thymine (T) is replaced by uracil (U) in RNA. DNA and RNA bases are also held together by chemical bonds and have specific base pairing rules.

Detailed explanation-4: -Three of the five nitrogenous bases are common to both DNA and RNA. These are adenine (A), cytosine (C), and guanine (G).

Detailed explanation-5: -Repeating units in DNA molecule is nucleotides. It contains phosphoric acid, nitrogenous base and deoxyribose sugar. Nitrogen base like Adenine, Guanine, Cytosine and Thymine are present.