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If a DNA sequence has 20% adenine (A), what percentage of cytosine (C) would you

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Question: If a DNA sequence has 20% adenine (A), what percentage of cytosine (C) would you expect it to have, assuming equal amounts of A-T and G-C pairs?

Options:

  1. 20%
  2. 30%
  3. 40%
  4. 50%

Correct Answer: 30%

Solution: 

If A = 20%, then T = 20%. The remaining 60% must be split between G and C, so C = 30%.

If a DNA sequence has 20% adenine (A), what percentage of cytosine (C) would you

Practice Questions

Q1
If a DNA sequence has 20% adenine (A), what percentage of cytosine (C) would you expect it to have, assuming equal amounts of A-T and G-C pairs?
  1. 20%
  2. 30%
  3. 40%
  4. 50%

Questions & Step-by-Step Solutions

If a DNA sequence has 20% adenine (A), what percentage of cytosine (C) would you expect it to have, assuming equal amounts of A-T and G-C pairs?
  • Step 1: Understand that in DNA, adenine (A) pairs with thymine (T) and guanine (G) pairs with cytosine (C).
  • Step 2: If the DNA sequence has 20% adenine (A), then it must also have 20% thymine (T) because A pairs with T.
  • Step 3: Add the percentages of A and T together: 20% (A) + 20% (T) = 40%.
  • Step 4: Since the total percentage of all bases (A, T, G, C) must equal 100%, subtract the percentage of A and T from 100%: 100% - 40% = 60%.
  • Step 5: The remaining 60% must be split equally between guanine (G) and cytosine (C).
  • Step 6: Divide the remaining percentage by 2 to find the percentage of C: 60% / 2 = 30%.
  • Step 7: Therefore, the expected percentage of cytosine (C) is 30%.
  • Base Pairing Rules – Understanding the complementary base pairing in DNA, where adenine pairs with thymine and guanine pairs with cytosine.
  • Percentage Calculation – Calculating the percentage of nucleotides based on given values and the total percentage of DNA components.
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