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प्रश्न
If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.
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उत्तर
According to Chargaff’s rule, the DNA molecule should have an equal ratio of pyrimidine (cytosine and thymine) and purine (adenine and guanine). It means that the number of adenine molecules is equal to thymine molecules and the number of guanine molecules is equal to cytosine molecules.
% A = % T and % G = % C
If double stranded DNA has 20% of cytosine, then according to the law, it would have 20% of guanine.
Thus, percentage of G + C content = 40%
The remaining 60% represents both A + T molecules. Since adenine and guanine are always present in equal numbers, the percentage of adenine molecule is 30%.
संबंधित प्रश्न
Group the following as nitrogenous bases and nucleosides:
Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine.
Chargaff’s rules are applicable to ______.
One turn of DNA possesses ______.
The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix ______.
While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine = 29%, Guanine = 17%, Cytosine = 32%, Thymine = 17%. Considering the Chargaff’s rule it can be concluded that ______.
What is the nature of the strands of the DNA duplex?
Protein helping in opening of DNA double helix in front of replications fork is ______.
How far is each base pair from the next one in DNA double helix model?
H-bonds between Cytosine and Guanine are ______.
By which bonds the purine and pyrimidine pairs of Complementary Strands of DNA held together?
Which ratio is constant for DNA?
In the polynucleotide chain of DNA, a nitrogenous base is linked to the -OH of ______
During in vitro synthesis of DNA, a researcher used 2’, 3’ – dideoxy cytidine triphosphate as raw nucleotide in place of 2’-deoxy cytidine. What would be the consequence?
What structural difference exists between the pentose sugar found in DNA and the pentose sugar found in RNA?
The backbone of a polynucleotide chain is formed by which components?
In a DNA double helix, where are the nitrogenous bases located?
What is the significance of the 2′-OH group in ribose compared to deoxyribose?
Why is the name 'deoxyribonucleic acid' appropriate for DNA?
A dinucleotide is formed by linking two nucleotides together. The bond formed between them is:
What structural difference exists between the pentose sugar found in DNA and the pentose sugar found in RNA?
The phosphate group in a nucleotide is attached to which carbon of the pentose sugar?
Which end of a polynucleotide chain contains a free phosphate group?
A dinucleotide is formed by linking two nucleotides together. The bond formed between them is:
Pyrimidines differ from purines in their basic structural feature. Which statement is correct?
