Using Chargaff’s rules, what are the most likely percentages of C and T in the r

Question

Using Chargaff’s rules, what are the most likely percentages of C and T in the rat DNA sample?

cytosine 23.9%, thymine 34%

cytosine 21.4%, thymine 28.4%

cytosine 33.8%, thymine 32.6%

cytosine 20.4%, thymine 32.6%

a)

cytosine 23.9%, thymine 34%

b)

cytosine 21.4%, thymine 28.4%

c)

cytosine 33.8%, thymine 32.6%

d)

cytosine 20.4%, thymine 32.6%

Percentages of Nitrogenous Bases organism | %A | %G | %C | %T Human 29.3 20.7 20.030.0 Chicken 28.0 21.6 Rat 28.4 21.4 E. coli 26.9 25.7 Using Chargaff's rules, what are the most likely percentages of C and T in the rat DNA sample? O cytosine 23.9%, thymine 34% O cytosine 21.4%, thymine 28.4% O cytosine 33.8%, thymine 32.6% O cytosine 20.4%, thymine 32.6%

Explanation / Answer

According to Chargaff's rule, [A] + [G] = [C] + [T] = 100%

Adenine(A) is paired to thymine (T), A=T

Cytosine (C) is paired to Guanine (G), G =C

Here A is 28.4% then T = 28.4%

A+T =56.8%

Guanine = 21.4%

G+C =100%

100 - 56.8 = 43.2%

C = 21.4 %

so answer is b) cytosine 21.4% thymine 28.4%

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