Ishlanishi:
1) 2T+3G=5A 3G=3T G=T
2T+2G=192 2T+2T=192 4T=192 T=48
2) H=5T H=5*48 H=240 Javob: C
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139. DNK molekulasidagi nukleotidlar soni 240 ta bo`lib, undagi
vodorod bog`lar soni G lar sonidan 5 marta ko`p bo`lsa vodorod
bog`lar sonini aniqlang.
A)198 B)200 C)240 D)300
Ishlanishi:
1) 2A+3G=5G 2A=2G A=G
2A+2G=240 2G+2G=240 4G=240 A=60
2) H=5G H=5*60 H=300 Javob: D
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140. DNK molekulasidagi nukleotidlar soni 240 ta bo`lib, undagi
vodorod bog`lar soni S lar sonidan 5 marta ko`p bo`lsa vodorod
bog`lar sonini aniqlang.
A)198 B)200 C)240 D)300_Ishlanishi:_1)_2A+3G=5A_3A=3G_A=G_2A+2G=240_2A+2A=240_4A=240_A=60_2)_H=5A_H=5*60_H=300_Javob:_D'>D)300
Ishlanishi:
1) 2A+3S=5S 2A=2S A=S
2A+2S=240 2S+2S=240 4S=240 S=60
2) H=5S H=5*60 H=300 Javob: D
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141. DNK molekulasidagi nukleotidlar soni 240 ta bo`lib, undagi
vodorod bog`lar soni A lar sonidan 5 marta ko`p bo`lsa vodorod
bog`lar sonini aniqlang.
A)198 B)200 C)240 D)300
Ishlanishi:
1) 2A+3G=5A 3A=3G A=G
2A+2G=240 2A+2A=240 4A=240 A=60
2) H=5A H=5*60 H=300 Javob: D
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142. DNK molekulasidagi nukleotidlar soni 240 ta bo`lib, undagi
vodorod bog`lar soni T lar sonidan 5 marta ko`p bo`lsa vodorod
bog`lar sonini aniqlang.
A)198 B)200 C)240 D)300
Ishlanishi:
1) 2T+3G=5G 2T=2G T=G
2T+2G=240 2T+2T=240 4T=240 T=60
2) H=5T H=5*60 H=300 Javob: D
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143. Bir DNK da 750 ta, 2-DNK da 1100ta nukleotid bo`lsa, 1-
DNK dagi purin asosi G lar sonidan 2,5 marta ko`p, 2-DNKdagi
adeninlar soni pirimidin sonidan 2,75 marta kam bo`lsa, 2ta
DNKdagi vodorod bog`lar ayirmasini aniqlang.
A)550 B)450 C)350 D250
Ishlanishi:
1) 1-DNK da H bog’larni topamiz:
2A+2G=750 A+G=2,5G A=1,5G
2) 2*1,5G+2G=750 5G=750 G=150
3) 2A+2*150=750 2A=750-300 2A=450 A=225
4) H=(2*225)+(3*150) H=450+450 H
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