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In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :
  • a)
    G 8.5%, A 50%, T 24.5%
  • b)
    G 34%, A 24.5%, T 24.5%
  • c)
    G 17%, A 16.5%, T 32.5%
  • d)
    G17%, A 33%, T 33%
Correct answer is option 'D'. Can you explain this answer?
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In sea urchin DNA, which is double stranded, 17 % of the bases were sh...
Calculation of Percentages of Other Three Bases

To calculate the percentages of the other three bases, we need to use Chargaff's rules. According to these rules, the amount of adenine (A) is equal to the amount of thymine (T), and the amount of guanine (G) is equal to the amount of cytosine (C).

Given that 17% of the bases were cytosine, we can calculate the percentage of guanine (G) as follows:

- Since G = C, the percentage of G is also 17%.

To calculate the percentages of adenine (A) and thymine (T), we can use the fact that the total percentage of all four bases must add up to 100%. Therefore:

- A + T + G + C = 100%
- A + T + 17% + 17% = 100%
- A + T = 66%

Now we know that the combined percentage of adenine and thymine is 66%. Since we also know that A = T (due to Chargaff's rules), we can divide 66% by 2 to get the percentage of each:

- A = T = 33%

Therefore, the expected percentages of the other three bases are:

- G: 17%
- A: 33%
- T: 33%

Correct Answer: Option D

Option D is the only one that matches the calculated percentages of G, A, and T. Option A has the correct percentage of A, but the incorrect percentages for G and T. Option B has the correct percentages of T and G, but the incorrect percentage for A. Option C has incorrect percentages for all three bases.
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In sea urchin DNA, which is double stranded, 17 % of the bases were sh...
Here cytosine is given 17% it forms triple bond with guanine so it's % is 17 % . Chargaff rule is followed, ratio btw A, T, G nd C are constant nd equals one. A nd T forms double bond their % is same i.e. is 100-34 = 66. both are 33 % . So, option D is correct.
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In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :a)G 8.5%, A 50%, T 24.5%b)G 34%, A 24.5%, T 24.5%c)G 17%, A 16.5%, T 32.5%d)G17%, A 33%, T 33%Correct answer is option 'D'. Can you explain this answer?
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In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :a)G 8.5%, A 50%, T 24.5%b)G 34%, A 24.5%, T 24.5%c)G 17%, A 16.5%, T 32.5%d)G17%, A 33%, T 33%Correct answer is option 'D'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :a)G 8.5%, A 50%, T 24.5%b)G 34%, A 24.5%, T 24.5%c)G 17%, A 16.5%, T 32.5%d)G17%, A 33%, T 33%Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are :a)G 8.5%, A 50%, T 24.5%b)G 34%, A 24.5%, T 24.5%c)G 17%, A 16.5%, T 32.5%d)G17%, A 33%, T 33%Correct answer is option 'D'. Can you explain this answer?.
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