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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
Which property of DNA double helix led Watson and Crick to hypothesise semi-conservative mode of DNA replication? Explain.
If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it?
A nucleoside differs from a nucleotide. It lacks the ______.
Both deoxyribose and ribose belong to a class of sugars called ______.
The fact that a purine base always paired through hydrogen bonds with a pyrimidine base leads to, in the DNA double helix ______.
How far is each base pair from the next one in DNA double helix model?
There is no DNA in ______.
Which of the following is a structural subunit of DNA?
A peptide chain assumes secondary structure through the formation of ______.
Which of the following is a purine?
A nucleotide is the monomer unit of a nucleic acid. Which of the following correctly identifies the three components of a nucleotide?
What type of bond connects a nitrogenous base to the pentose sugar in a nucleotide?
Which end of a polynucleotide chain contains a free phosphate group?
The 3′ end of a polynucleotide chain is characterized by the presence of:
In a DNA double helix, what is the spatial relationship between the two polynucleotide strands?
Why is the name 'deoxyribonucleic acid' appropriate for DNA?
Pyrimidines differ from purines in their basic structural feature. Which statement is correct?
A nucleotide is the monomer unit of a nucleic acid. Which of the following correctly identifies the three components of a nucleotide?
Which of the following nitrogenous bases is classified as a purine with a double-ring structure?
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, what is the spatial relationship between the two polynucleotide strands?
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?
