G=50 2A+3*50=320
2A=170
A=65 5) H=3G H=3*50=150 Javob: B ____________________________
117. Ma`lum sharoitda 45,9 nm uzunlikdagi DNK malekulasi
Eco.RI restiriktaza fermenti ta`sirida ABC bo`lakka bo`lindi.Hosil
bo`lgan barcha DNK malekulasidagi vodorod bog`lar soni dastlabki
vodorod bog`lar sonidan 5% ga kam bo`lsa hosil bo`lgan DNK
malekulasidagi A-T orasidagi vodorod bog`lar sonini toping.
A)170 B)150 C)250 D)154 Ishlanishi: 1) N=L/0,34 N=45,9/0,34=135 135*2=270
2) Eco.RI har bir kesgan joyda AATT orasidagi H bog’larni
uzadi. 2+2+2+2=10 A-T=2*4=8 ta
2 joydan kesilgan va ABC bo’laklarga bo’lingan: 8*2=16
3) 16---5%
x---100% x=(16*100)/2=320
4) 2A+3G=320
2A+2G=270
G=50 2A+3*50=320
2A=170
A=65 5) H=2A H=2*65=170 170-16=154 Javob: D ____________________________
118. Ma`lum sharoitda 45,9 nm uzunlikdagi DNK malekulasi
Eco.RI restiriktaza fermenti ta`sirida ABC bo`lakka bo`lindi.Hosil
bo`lgan barcha DNK malekulasidagi vodorod bog`lar soni dastlabki
vodorod bog`lar sonidan 5% ga kam bo`lsa hosil bo`lgan DNK
malekulasidagi G-S orasidagi vodorod bog`lar sonini toping.
A)170 B)150 C)250 D)154 Ishlanishi: 1) N=L/0,34 N=45,9/0,34=135 135*2=270
2) Eco.RI har bir kesgan joyda AATT orasidagi H bog’larni
uzadi. 2+2+2+2=10 A-T=2*4=8 ta
2 joydan kesilgan va ABC bo’laklarga bo’lingan: 8*2=16
3) 16---5%
x---100% x=(16*100)/2=320
4) 2A+3G=320
2A+2G=270
G=50 2A+3*50=320
2A=170
A=65 5) H=3G H=3*50=150 Javob: B ____________________________
119. 6600 malekular og`irlikdagi oqsil sintezlashda ishtirok
etgan DNK malekulasi uzunligi aniqlang. Oqsildagi bitta
aminokislotaning o`rtacha og`irligi 120, qo`shni nukleotidlar
orasidagi masofa 0,34 nm
