THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If the percentage of DNA is made of 30% Thymine, what is the correct percentage of Guanine?
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30
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15
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20
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60
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Explanation:
Detailed explanation-1: -Answer and Explanation: A double-stranded DNA molecule with 20% thymine would contain 30% guanine.
Detailed explanation-2: -So, for this DNA sequence, C + G = 60%. The remaining 40% of the sequence must consist of A-T pairs (adenine-thymine). Therefore, 20% of the sequence is made up of adenine, and 20% of the sequence is made up of thymine.
Detailed explanation-3: -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.
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