A DNA molecule has 240 base pairs and 35% cytosine. How many Adenine
nucleotides are present in this molecule of DNA?
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Four types of nucleotides are present in DNA molecule
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DNA molecule has 240 base pairs means that there are 480 bases (1 base pair = 2 bases)
Out of which 35% is Cytosine means
480* 35/100 = 168 bases.
These 168 bases are of Cytosine and we know that Cytosine joins with Guanine. So there will be equal number of Guanine bases means
480 - 168 - 168 = bases of Adenine, Thy.
^. ^
Guanine Cytosine
Means 144 bases left these bases are of Adenine and Thymine
Bases of Adenine => 144/2 = 72
OR
U can directly calculate 15% of 480 as 35% is cytosine means 15% will be thymine by Chargaff’s rule and adenine binds with thymine so it will also be 15% .
Out of which 35% is Cytosine means
480* 35/100 = 168 bases.
These 168 bases are of Cytosine and we know that Cytosine joins with Guanine. So there will be equal number of Guanine bases means
480 - 168 - 168 = bases of Adenine, Thy.
^. ^
Guanine Cytosine
Means 144 bases left these bases are of Adenine and Thymine
Bases of Adenine => 144/2 = 72
OR
U can directly calculate 15% of 480 as 35% is cytosine means 15% will be thymine by Chargaff’s rule and adenine binds with thymine so it will also be 15% .
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