They are both nucleic acids. Regarding structure, DNA and RNA are similar because they are both built of nucleotides, structures consisting of one nucleobase, a sugar (ribose or deoxyribose respectively) and a phosphate group.
Recent intake recommendations to meet the lysine requirement range from 64 to 30 mg/(kg Â· d) for 0.5-y infants and adults (>18 y), respectively. Lysine intake in the Western human diet is in the range 40â180 mg/(kg Â· d). An upper limit of 300â400 mg/(kg Â· d) can be considered in humans. l-Lysine is a basic amino acid characterized by the presence of an amino group at the end of a 4-carbon aliphatic side chain [-(CH 2) 4-NH 3 +].
[12] suggested, based on a factorial approach, that the needs for indispensable amino acids in infants three to six months of age were much lower than those in the 1985 FAO/WHO/UNU report [9]. For example, the requirements for lysine were estimated at 63 mg/kg/day by Dewey et al. and at 103 mg/kg/day by FAO/WHO/UNU.