A) 240 B) 960 C) 600 D) 320
Ishlanishi: 1) N=AK*3 N=400*3=1200N*2=2400N -2 ta ipdagi N lar
2) 2400---100%
G-x---40% G-x=(2400*40)/100=960N G-960=960-S
3) 960----40%
A-x---10% A-x=(960*10)/40=240 A-240=240-T Javob: A _____________________________ 229. Ma’lum bir oqsil sintezida ishtirok etuvchi DNK qo'sh
zanjirida nukleotidlar soni 846 taga teng. Hujayra kimyoviy modda
ta’sirida mutatsiyaga uchrashi natijasida 12 juft nukleotid yo'qolgan
bo'lsa, DNKning bitta zanjirida nechta fosfodiefir bog’lari qoladi?
(Nuklein kislota molekulasida nukleotidlar o'zaro fosfodiefir bog'lari
yordamida bog'lanadi.)
A) 833 B) 410 C) 416 D) 820
Ishlanishi: 1) 846N-24=822N -2 ta ipdagi N lar
2) 822/2=411 -1 ta ipdagi N lar
3) F=N-1 F=411-1=410F Javob: B _____________________________ 230. DNK ning qo'sh zanjirida G nukleotidlari 40% ni tashkil
etadi. DNK dagi gen asosida sintezlangan oqsil 400 ta
aminokislotadan iborat bo’lsa, shu DNK qo‘sh zanjiridagi
fosfodiefir bog’lari sonini toping, (nukleotidlar o'zaro fosfodiefir
bog’i orqali bog’lanadi)
A) 2400 B) 2399 C) 1198 D) 2398 Ishlanishi: 1) N=AK*3 N=400*3=1200N*2=2400N -2 ta ipdagi N lar
2) 2400---100%
G-x---40% G-x=(2400*40)/100=960N G-960=960-S
3) 960----40%
A-x---10% A-x=(960*10)/40=240 A-240=240-T
4)A+G=N 240+960=1200 -1 ta ipdagi N lar
5) F=(N-1)2N-2 F=(2*1200)-2=2398F Javob: D _____________________________ 231. DNK ning qo'sh zanjirida G nukleotidlari 40%ni tashkil
etadi. DNK dagi gen asosida sintezlangan oqsil 400 ta
aminokislotadan iborat bo'lsa, shu DNK qo'sh zanjiri asosida
sintezlangan i-RNKdagi fosfodiefir bog'lari sonini toping,
(nukleotidlar o'zaro fosfodiefir bog' orqali bog'lanadi)
A) 2398 B) 1199 C) 2399 D) 2400
Ishlanishi: 1) N=AK*3 N=400*3=1200N*2=2400N -2 ta ipdagi N lar
2) 2400---100%
G-x---40% G-x=(2400*40)/100=960N G-960=960-S
3) 960----40%
A-x---10% A-x=(960*10)/40=240 A-240=240-T
4)A+G=N 240+960=1200 -1 ta ipdagi N lar
5) F=(N-1)2N-2 F=1200-1=1199F Javob: B
