Concept explainers
(a)
To determine: If Chargaff’s rule implied that equal amounts of guanine and adenine are present in DNA.
Interpretation: Whether Chargaff’s rule implied that the equal amounts of guanine and adenine are present in DNA is to be stated.
Concept introduction: James and Watson in
According to Chargaff’s rule the DNA contains the equimolar amounts of guanine and cytosine and also equimolar amounts of adenine and thymine.
This means that
The pyrimidine bases are cytosine and thymine and purine bases are guanine and adenine that are present in DNA.
(b)
To determine: If Chargaff’s rule implied that the sum of purine residues equals the sum of pyrimidine residues.
Interpretation: Whether Chargaff’s rule implied that the sum of purine residues equals the sum of pyrimidine residues is to be stated.
Concept introduction: James and Watson in
According to Chargaff’s rule the DNA contains the equimolar amounts of guanine and cytosine and also equimolar amounts of adenine and thymine.
This means that
The pyrimidine bases are cytosine and thymine and purine bases are guanine and adenine that are present in DNA.
(c)
To determine: If Chargaff’s rule applied only to double-stranded DNA or it would also apply to individual strand if the double helical strand were separated into its two complementary strands.
Interpretation: Whether Chargaff’s rule applied only to double-stranded DNA or it would also apply to individual strand if the double helical strand were separated into its two complementary strands is to be stated.
Concept introduction: James and Watson in
According to Chargaff’s rule, the DNA contains the equimolar amounts of guanine and cytosine and also equimolar amounts of adenine and thymine.
This means that
The pyrimidine bases are cytosine and thymine and purine bases are guanine and adenine that are present in DNA.
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