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biology DNA question

Biology
Tutor: None Selected Time limit: 1 Day

DNA has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. One aspect of DNA that allows it to accurately store genetic information is the base pairing from Chargaff's first rule of the four nucleotide bases. If the A content of a DNA molecule is 16%, what are the percentages of the remaining bases?

T=? C=? G=?

Mar 29th, 2015

Chargaffs first rule states that [A] +[T]= [C]+[G]

We know that Adenine pairs with Thymine, and Cytosine  pairs with Guanine. 

Therefore A=T

and C=G

A is 16%, therefore T must be 16%

A+T=32%

Now subtract that number from 100%

100%-32%=68%

We know that C must equal G

Therefore divide 68% into two.

68/2= 34%

The final answer is

A=16%

T=16%

G=34%

C=34%

( add 16+16+34+34= 100%)

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Mar 29th, 2015

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