Question

DNA molecule has 20 adenine and 30 cytosine bases what will be the total no of purine bases in the given sample

Answer 1

Cytosine is purine base
No. =30 (given)
Adenine is complementary to thymine which is a purine base
No. = 20 (given)
So, total no. Of purine bases =30 +20 50

Answer 2

Answer:

The answer is 50 bases.

Explanation:

According to Chargaff’s rule, The number of Adenine residues is equal to the thymidine, and Cytosine residues are equal to guanine residues. Therefore A=T and G=C.

Hence the A + G = T + C,

Purines= Pyrimidines,

20+ 30= 20+30 ( A= 20 therefore T is also 20 similarly C=30 and G will also be 30)

50=50

Therefore the total number of purine bases i.e. A+G= 50.

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