If a double-stranded DNA has 30 % adenine,wha | vedclass

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(B) According to Chargaff's rule for double-stranded $DNA$,the amount of adenine $(A)$ is equal to the amount of thymine $(T)$,and the amount of guani

Vedclass · Accepted Answer

$20$

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(B) According to Chargaff's rule for double-stranded $DNA$,the amount of adenine $(A)$ is equal to the amount of thymine $(T)$,and the amount of guanine $(G)$ is equal to the amount of cytosine $(C)$.Given: $A = 30 \%$.Since $A = T$,then $T = 30 \%$.The sum of all bases is $A + T + G + C = 100 \%$.Substituting the values: $30 \% + 30 \% + G + C = 100 \%$.$60 \% + G + C = 100 \%$.$G + C = 100 \% - 60 \% = 40 \%$.Since $G = C$,we can write $2C = 40 \%$.Therefore,$C = 20 \%$.Thus,the percentage of cytosine is $20 \%$.

If a double-stranded $DNA$ has $30 \%$ adenine,what is the percentage of cytosine in the same $DNA$ (in $\%$)?

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