21. Thirty percent of the bases in DNA extracted from a prokaryotic cell is adenine. What percentage of cytosine is present in this DNA?
a. 10        b. 20         c. 30         d. 40

Remember that A = T and G = C.  If the value for A is 30% then the value of T = 30%.  That leaves 40% due to G and C with G representing 20% and C representing the remaining 20%.

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Emma Erdahl, Associate Professor of Biology
Northern Virginia Community College
Revised 8/23/00