TASASAGSTSTG 2) A-T lar jami 5 ta, G-S lar jami 7 ta H=(6*2)+(6*3)=
30 J:C ____________________________
56. Muayyan DNK bo’lagini 1-ipida AAGSGTAGT nukleotidlar
qatori bor. Shu DNK ning 2-ipidan sintezlangan RNK dagi
nukleotidlar qatorini toping.
A) AAGSGUAGU B) AAGSGUAGUC
C) GSUUSGTTSU
D) AAGSGTUAGU
Ishlanishi: 1) DNK dagi 1-zanjir - AAGSGTAGT
DNK dagi 2-zanjir -
T T SGSAT SA 2) i-RNK dagi zanjir -
AAGSGUAGU Javob: A ____________________________
57. DNK molekulasini ikki ipida 6400 ta nukleotid bor. Umumiy
nukleoitlarni 25 % i adenin. 1-ipda timin nukleotidini 70 % i,
guaninlarni esa 30 % joylashgan. DNK molekulasida nechta
vodorod bog’ mavjud
A) 800
B) 8000 C) 1600 D) 16000
Ishlanishi: 1) 6400-100%
x--- 25% x=(6400*25)/100=1600
A=25% bo’lgani uchun T-G-S lar ham 25% dan bo’ladi, ya’ni
A=T=G=S=A-1600
2) H=2A+3G H=(2*1600)+(3*1600)=3200+4800=
8000 J: B ____________________________
58. Timin uchramaydigan nuklein kislota tarkibida 43 ta A, 23 ta
G, 65 ta S, va 90 ta U bor. Shu molekula sintezlangan DNK dagi
nukleotidlar sonini toping?
A) 884
B) 442 C) 221 D) 1768
Ishlanishi: 1) i-RNK: A=43, G=23, S=65, U=90 .
1-ipda:
T=43, S=23, G=65; A=90; 2-ipda: A=43, G=23, S=65, T=90;
2) N=(T=43+S=23+G=65+A=90)*2 N=221*2 N=
442 J:B ____________________________
59. DNK molekulasining ikki ipida 12800 ta nukleotid bor
bo’lib, shulardan 1600 tasi timin. Agar sitozinlarni 1920 tasi 2-ipda
joylashgan bo’lsa, shu molekula tuzilishida qatnashgan vodarod
bog’lar sonini toping
A)28800
