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205. DNK qo`sh zanjirida 126 ta vodorod bog` bo`lib
sitozin
purin asosidan 1,6 marta kam bo`lsa, DNK uzunligini aniqlang.
A)16,32
B)32,64 C)18,36 D)36,72
Ishlanishi:
1) 2A+3G=126
S=A+G/1,6 S=G
A+G=1,6G
A=1,6G-G
A=0,6G
2) 2*0,6G+3G=126
1,2G+3G=126
4,2G=126
G=30
3) 2A+3*30=126
2A=126-90
2A=36
A=18
4) L=(A+G)*0,34 L=(18+30)*0,34=
16,32nm
Javob: A
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206. DNK qo`sh zanjirida 510 ta vodorod bog` bo`lib sitozin
purin asosidan 2,333 marta kam bo`lsa, DNK uzunligini aniqlang.
A)71,4nm
B)44 C)88 D)22
Ishlanishi:
1) 2A+3G=510
S=A+G/2,333 S=G
A+G=2,333G
A=2,333G-G
A=1,333G
2) 2*1,333G+3G=510
2,666G+3G=510
5,666G=510
G=90
3) 2A+3*90=510
2A=510-270
2A=240
A=120
4) L=(A+G)*0,34 L=(120+90)*0,34=
71,4nm
Javob: A
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207. DNK qo`sh zanjirida 510 ta vodorod bog` bo`lib sitozin
purin asosidan 2,333 marta kam bo`lsa, DNK fosfodiefir bog`lar
sonini aniqlang.
A)418ta
B)510ta C)390ta D)260ta
Ishlanishi:
1) 2A+3G=510
S=A+G/2,333 S=G
A+G=2,333G
A=2,333G-G
A=1,333G
2) 2*1,333G+3G=510
2,666G+3G=510
5,666G=510
G=90
3) 2A+3*90=510
2A=510-270
2A=240
A=120
4) N=(A+G)*2 N=(120+90)*2=420
5) F=N-2 F=420-2=
418F
Javob: A
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208. DNK qo`sh zanjirida 510 ta vodorod bog` bo`lib sitozin
purin asosidan 2,333 marta kam bo`lsa, DNK umumiy nukleotidlar
sonini aniqlang.
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