11 56 1 1 1 A A B C D 2 B A B C D 3 C A B C D 4 D A B C D 5 C A B C D 6 DNA RNA C A B C D 7 B A B C D 8 A A B C D 9 B A B C D 10 50% D A B C D 11 ATP C A Ca2+ B Mg2+ C PO43- D Cl 12 1 10% 2 12% 3 14% 4 16% 4 A A 1 B 2 C 3 D 4 13 C A B C D 14 A A B C D 15 C A B C D 16 109 NH2 COOH D A 110 110 B 109 109 C 9 9 D 1 1 17 D A B C D 18 C A B C D 19 574 4 D A 573 573 B 573 570 C 570 573 D 570 570 20 3 1 2 3 (54) 29 A B C 2 3 2 30 Mg2 Fe2 H | H C | NH2 COOH C H | CH3 COOH | NH2 H C NH2 | | COOH CH2 CH2
