2 5 5 0 0 A " : 3 , 4 A " x 2 = 15000nucle6tit ; ^ •'/V;;-s
A = T = 15000 X 15% = 2250 nucleotit
G = X 15000 X 35% = 5250 nucleotit 1-0
3. So' lifdng tiifng loai nucleotit trong moi phan tu" A D N mdi dtfcJc hinh thanh sau dot bien: Co 2 trndng hcfp: sau dot bien: Co 2 trndng hcfp:
+ Ta c6: 2100 lien ke't hidro la lien ke't giffa A vdi T suy ra so nucleotit A ciia phan tuT A D N trong NST thi? nha't bi giam Ik: 2100 : 2 = 1050 nucleotit vi 2 doan NST chuyen doan dai bang nhau. Nen A - T giam di bao nhieu thi G - X tang len bay nhicu.
So li/dng tufng loai nucleotit cua phan tur A D N mdi ma phan Idn vat chat di truyen c6 nguon go'c tijf NST ihiJ nhat:
A = T = 4200 - 1050 = 3150 nucleotit G = X = 6300 + 1050 = 7350 nucleotit
So' lU'dng tifng loai nucleotit cua phan tuf A D N mdi ma phan Idn vat chat di truyen c6 nguon goc tit NST thu" hai:
A = T = 2250 + 1050 = 3300 nucleotit G = X = 5250 - 1050 = 4200 nucleotit
+ Ta CO 2100 lien ket hidro la lien ket giffa G vdi X so nucleotit G cua phan tu: A D N trong NST thu" nhat bi giam di la: 2100 : 3 = 700 nucleotit
So Itfdng tufng loai nucleotit cua phan tit A D N mdi ma phan Idn vat chat di truyen cd nguon goc tuT NST thi? nhat:
A = T = 4200 - 700 = 3500 nucleotit M' G = X = 6300 + 700 = 7000 nucleotit
86' lifdng tiTng loai nucleotit ciia phan tuT A D N mdi ma phan Idn vat cha't di truyen c6 nguon goc tiT NST thu" hai:
i, A = T = 2250 + 700 = 2950 nucleotit
G = X = 5250 - 700 = 4550 nucleotit
Bai 18: Mot phan tuT ADN dai 39474 A " bi dot bien mat di mot doan. Doan mat A
di CO ti le — = 25% . Do hien tiTdng ma't doan dd ngiTdi ta thay giam di 70 lu'dt G
phan tur tARN tham gia vao qua trinh tdng hdp protein xay ra sau dd. 1. Doan phan tu* A D N con lai cd bao nhieu nucleotit?
2. Neu doan phan tu" A D N con lai tu" nhan doi mot Ian thi so liTdng tijfng loai nucleotit lay tif moi tru'dng npi bao so vdi khi chu'a maft doan giam di bao nhieu? nucleotit lay tif moi tru'dng npi bao so vdi khi chu'a maft doan giam di bao nhieu?
3. Gia thiet doan A D N con lai chu'a 10 gen cd chieu dai bkng nhau, moi gen deu tdng hdp mot phan tuf mARN, cac phan tu" mARN deu de so liTdt riboxom deu tdng hdp mot phan tuf mARN, cac phan tu" mARN deu de so liTdt riboxom triTdt qua bang nhau, giai ma tdng hdp dtfdc 56850 axit amin.
Hoi moi phan tur mARN da tdng hdp dufdc bao nhieu phan tiJT protein.
Cty TNHH MTV DVVH Khang Vigt
Hitdng dan
1. Doan phan tur ADN con lai chu'a bao nhieu nucleotit: ,
39474 A"
Phan tur A D N cd: x 2 = 23220 nucleotit 3,4
- Doan phan tuT ADN bi mat cd: 70 x 3 x 2 = 420 nucleotit - Doan phan tur ADN con lai cd: 23220 - 420 = 22800 nucleotit