In a DNA molecule, if 30% of the bases are adenine, what will be the percentage of cytosine bases?
एक डीएनए अणु में, यदि 30% क्षार एडेनिन (adenine) हैं, तो साइटोसिन (cytosine) क्षारों का प्रतिशत क्या होगा?
Chargaff's Rules of Base Pairing:
- According to Erwin Chargaff's rules for double-stranded DNA:
- The molar ratio of Adenine (A) equals Thymine (T): $[A] = [T]$
- The molar ratio of Guanine (G) equals Cytosine (C): $[G] = [C]$
- The sum of all four bases equals 100%:
$$[A] + [T] + [G] + [C] = 100\%$$- Calculation:
- Given: $[A] = 30\%$
- Therefore: $[T] = [A] = 30\%$
- Total for $A + T = 30\% + 30\% = 60\%$
- Total remaining for $G + C = 100\% - 60\% = 40\%$
- Since $[G] = [C]$:
Therefore, the percentage of cytosine bases is 20%.
Correct Answer: Option 4 (20%).
विस्तृत व्याख्या:
Chargaff's Rules of Base Pairing (चारगाफ के नियम):
- According to Erwin Chargaff's rules for double-stranded DNA:
- The molar ratio of Adenine (A) equals Thymine (T): $[A] = [T]$
- The molar ratio of Guanine (G) equals Cytosine (C): $[G] = [C]$
- The sum of all four bases equals 100%:
$$[A] + [T] + [G] + [C] = 100\%$$- Calculation:
- Given: $[A] = 30\%$
- Therefore: $[T] = [A] = 30\%$
- Total for $A + T = 30\% + 30\% = 60\%$
- Total remaining for $G + C = 100\% - 60\% = 40\%$
- Since $[G] = [C]$:
Therefore, the percentage of cytosine bases is 20%.
Correct Answer: Option 4 (20%).
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
Report
Want to practice this paper in exam conditions?
क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं?
Test yourself in 5-question batch format with timer and hidden answers.
5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।
Start Practice Mode →
प्रैक्टिस टेस्ट मोड शुरू करें →