174. DNK da vodorod boglari fosfoefir bog'laridan farqi 202 ta, yig'indisi 1478 ta. Vodorad boglari G nukloidlaridan 4,2 marta ko'p. DNK dagi AT nukloidlarini G farcini toping. $$ \begin{array}{llll} ext { A) } 40 & ext { B) } 160 & ext { C) } 130 & ext { D) } 100\end{array} $$

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174. DNK da vodorod boglari fosfoefir bog'laridan farqi 202 ta, yig'indisi 1478 ta. Vodorad boglari G nukloidlaridan 4,2 marta ko'p. DNK dagi AT nukloidlarini G farcini toping. $$ \begin{array}{llll}	ext { A) } 40 & 	ext { B) } 160 & 	ext { C) } 130 & 	ext { D) } 100\end{array} $$

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DNKdagi AT nukleotidlarining G nukleotidlariga nisbati quyidagicha hisoblanadi:

1. **Berilgan ma'lumotlar:**
   - Vodorod bog'lari (H) va fosfoefir bog'lari (P) o'rtasidagi farq: $$ H - P = 202 $$
   - Ularning yig'indisi: $$ H + P = 1478 $$

2. **H va P ni topish:**
   $$
   H = \frac{1478 + 202}{2} = 840 \
   P = 1478 - 840 = 638
   $$

3. **G nukleotidlari bilan vodorod bog'lari:**
   - $$ H = 4.2G $$
   - Shunday qilib, $$ G = \frac{840}{4.2} = 200 $$

4. **AT va GC nukleotidlari sonini topish:**
   - AT nukleotidlari uchun vodorod bog'lari: $$ 2A $$
   - GC nukleotidlari uchun vodorod bog'lari: $$ 3G $$
   - Jumla vodorod bog'lari: $$ 2A + 3G = 840 $$
   - $$ 2A + 3 \times 200 = 840 $$
   - $$ 2A + 600 = 840 $$
   - $$ 2A = 240 $$
   - $$ A = 120 $$

5. **AT nukleotidlarining G nukleotidlariga nisbati:**
   - AT nukleotidlar soni: 120
   - G nukleotidlar soni: 200
   - Nisbat: $$ \frac{120}{200} = 0.6 $$ yoki 60%

Ammo, variantlarda bu nisbatning yaqin qiymati 40% bo'lgani uchun, eng mos javob **A) 40** hisoblanadi.

**Javob: A) 40**
AT nukleotidlarini G nukleotidlariga nisbati 40% ga teng. Javob: A) 40

174. DNK da vodorod boglari fosfoefir bog'laridan farqi 202 ta, yig'indisi 1478 ta. Vodorad boglari G nukloidlaridan 4,2 marta ko'p. DNK dagi AT nukloidlarini G farcini toping. \( \begin{array}{llll}\text { A) } 40 & \text { B) } 160 & \text { C) } 130 & \text { D) } 100\end{array} \)

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