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201. DNK qo`sh zanjirida 198 ta vodorod bog`I bo`lib guanin
umumiy nukleotidlardan 3,5 marta kam bo`lsa umumiy
nukleotidlarni toping.
A)154 B)88 C)132 D)110
Ishlanishi:
1) 2A+3G=198
G=2A+2G/3,5
2A+2G=3,5G
2A=3,5G-2G
2A=1,5G
2) 1,5G+3G=198
4,5G=198
G=44
3) 2A+3*44=198
2A=198-132
2A=66
A=33
4) N=(A+G)*2 N=(33+44)*2=77*2=154N Javob: A
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202. DNK qo`sh zanjirida 198 ta vodorod bog`I bo`lib guanin
umumiy nukleotidlardan 3,5 marta kam bo`lsa, DNK uzunligini
aniqlang.(qo`shni nukleotidlar orasidagi masofa 0,34nm)
A)26,18 B)52,36 C)67,32 D)33,66
Ishlanishi:
1) 2A+3G=198
G=2A+2G/3,5
2A+2G=3,5G
2A=3,5G-2G
2A=1,5G
2) 1,5G+3G=198
4,5G=198
G=44
3) 2A+3*44=198
2A=198-132
2A=66
A=33
4) L=(A+G)*0,34 N=(33+44)*0,34=26,18nm Javob: A
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203. DNK qo`sh zanjirida 198 ta vodorod bog`I bo`lib guanin
umumiy nukleotidlardan 3,5 marta kam bo`lsa G-S orasidagi va A-T
orasidagi vodorod bog`lar farqini aniqlang.
A)66 B)44 C)88 D)22
Ishlanishi:
1) 2A+3G=198
G=2A+2G/3,5
2A+2G=3,5G
2A=3,5G-2G
2A=1,5G
2) 1,5G+3G=198
4,5G=198
G=44
3) 2A+3*44=198
2A=198-132
2A=66
A=33
4) H=2A-3G H=(2*33)-(3*44)=66-132=66N Javob: A
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204. DNK qo`sh zanjirida 126 ta vodorod bog` bo`lib sitozin
purin asosidan 1,6 marta kam bo`lsa, umumiy nukleotidlarni
aniqlang.
A)96 B)98 C)104 D)108
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) N=(A+G)*2 N=(18+30)*2=48*2=96N Javob: A
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