THE MOLECULAR BASIS OF INHERITANCE
DNA MAKES RNA MAKES PROTEIN
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If there is 30% cytosine in DNA how much guanine would be in the cell?
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60% guanine
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70% guanine
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30% guanine
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25% guanine
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Explanation:
Detailed explanation-1: -The percentage of guanine is 20%.
Detailed explanation-2: -Answer: There would be 20% Cytosine. Adenine (30%) = Thymine (30%) Guanine (20%) = Cytosine (20%)
Detailed explanation-3: -If a DNA sample is made up of 30% guanine, then it must contain an equal amount (30%) of cytosine (C). So, for this DNA sequence, C + G = 60%. The remaining 40% of the sequence must consist of A-T pairs (adenine-thymine).
Detailed explanation-4: -Thymine – 30%, Guanine – 20%, Cytosine – 20%. Chargaff’s nitrogen base pairing rule which states that amount of adenine is equal to thymine and guanine is equal to cytosine.
Detailed explanation-5: -Therefore, the answer is T = 30%, A = 30%, G = 20% and C = 20%.
There is 1 question to complete.