Q168 / 200 · NEET 2021 · Zoology

If Adenine makes $30 %$ of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?

A
$T : 20; G : 30; C : 20$
B
$T : 20; G : 20; C : 30$
Correct answer
C
$T : 30; G : 20; C : 20$
D
$T : 20; G : 25; C : 25$

Solution

According to Chargaff's principle,

A

is equal to

T

and

G

is equal to

C

. Hence, if the total is

100

and

A

is

30

then

T

will also be

30 .

Likewise

G + C

will be

40,

so,

G = 20, C = 20

.

Hence, the correct answer is option: 'C'.

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