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Double Stranded DNA is paired, with

Adenine paired with Thymine

Cytosine paired with Guanine

Then the percent Cytosine in one strand will be exactly the percent Guanine in the other strand.

And between the two strands, the percent Cytosine will be equal to the percent Guanine.

For a random distribution, the percent should be about 25% for each nucleotide, or 50% for the GC pair, and 50% for the AT pair.

However, DNA actually varies considerably from organism to organism.

Streptomyces coelicolor A3(2), has a GC content as high as 72%

Plasmodium falciparum has a GC content as low as 20%.

See Wikipedia link on GC Content.

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13y ago
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13y ago

37%. Adenosine pairs with thymidine while cytosine pairs with guanidine. Since 13% of the DNA is adenosine it means that 13% must be thymidine (since in a double stranded piece of DNA there are no bases without partners). 13% (adenine)+13% (thymidine) = 26%. 100% (total DNA)-26% (adenine and thymidine) = 74% (cytosine and guanidine). Half of the bases in the 74% are cytosine and half are guanidine (since there are no bases without partners). 74% divided by 2 = 37%. So the final make-up of the DNA is:

13% adenine

13% thymidine

37% guanidine

37% cytosine.

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15y ago

according to my text (genetics) states the % is 17 in a double-stranded DNA for cytosine.

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14y ago

30 percent

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Wiki User

11y ago

25 %

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Anonymous

Lvl 1
3y ago

F

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Q: What is the percent of cytosine in a DNA?
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