Answer:
12%
Step-by-step explanation:
The percentage of Guanine and Cytosine in DNA are equal to each other, as one molecule of guanine bonds with one molecule of cytosine.
- If 12% of the nitrogenous bases are guanine, then another 12% will be Cytosine.
Conversely, the percentage of adenine and thymine in DNA are equal to each other.