If a molecule of DNA has 30% Adenine how much of the other bases will be present? Thymine: 30% Cytosine: 15% Guanine: 15%
Thymine: 30% Cytosine: 15% Guanine: 15%

Thymine: 30% Cytosine: 20% Guanine: 20%
Thymine: 30% Cytosine: 20% Guanine: 20%

Thymine: 15% Cytosine: 30% Guanine: 30%
Thymine: 15% Cytosine: 30% Guanine: 30%

Thymine: 20% Cytosine: 30% Guanine: 30%

If a DNA molecule has 30% Adenine the percentage of the other bases is Thymine: 30% Cytosine: 20% Guanine: 20%.

Explanation:

When the percentage that a base has in a DNA molecule is given, the percentage of the other bases can be known using the Chargaff's base pair rule.

A DNA molecule has the information of the genome of a living being, according to a specific sequence of its nitrogenous bases adenine, guanine, cytosine and thymine.

Chargaff was able to establish that in a DNA molecule the ratio of purine : pyrimidine of 1:1, so there must be the same amount of thymine as adenine and a similar amount of guanine for the cytosine, taking into account the complementarity of bases.

Taking into account the law of the base pair, if in a DNA chain there is 30% of Adenine, in the molecule there is:

In this case, the Chargaff rule is useful to determine the percentage of nitrogenous bases that exist in a DNA molecule, knowing the percentage of a single base.

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