BIOLOGY
NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Analysis of a molecule of DNA found it to contain 200 adenine bases, 20% of the total number of bases in the strand. How many phosphate groups did it contain?
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200
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400
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800
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1000
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Explanation:
Detailed explanation-1: -A segment of DNA contains 1200 nucleotides, of which 200 have adenine base.
Detailed explanation-2: -Since adenine is 20%, then thymine is 20% as well. The total of both is 40%. From 100 remains 60% which is divided equally between guanine and cytosine, so each is 30%.
Detailed explanation-3: -In a segment of DNA molecule there occurs 200 molecules of adenine nitrogen bases and 200 molecules of cytosine nitrogen bases.
Detailed explanation-4: -If 20% of the nucleotide are adenine, then 20% of the nucleotide are thymine. The remaining 60% is divided equally between cytosine and guanine; each would compose 30% of the molecule. This is known as Char gaff’s rules.
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