Answer:
If in a DNA strand the percentage of adenine is 33%, the percentage of the other bases in the molecule will be 33% for thymine, 17% for cytosine and 17% for guanine.
Step-by-step explanation:
The DNA molecule possesses the information of the genome of a living being, according to a specific sequence of its nitrogenous bases adenine, guanine, cytosine and thymine.
Calculating the percentage or approximate proportion of nitrogenous bases in a DNA molecule can be established, approximately, according to the base pair rule of Chargaff.
Chargaff established in his observations that the DNA in a cell has a 1:1 purine : pyrimidine ratio, so there must be an equivalent amount of thymine for adenine and a similar amount of guanine for cytosine, since they are complementary bases.
According to the law of the base pair, if in a DNA strand there is 33% adenine, in the molecule there will be:
- Adenine 33%.
- Thymine 33%.
- Cytosine 17%.
- Guanine 17%.
- Total ..... 100%
This rule applies to both strands, since the percentage of bases in a single strand will depend on the specific sequence of bases it has.