If the DNA in a cell consists of 20% adenine, then it will also contain ___ guanine.Multiple Choice20%80%30%40%10%
Question
If the DNA in a cell consists of 20% adenine, then it will also contain ___ guanine.Multiple Choice20%80%30%40%10%
Solution
The answer is 30%.
Here's the step-by-step explanation:
In DNA, adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). This is known as the base pairing rule or Chargaff's rule.
If the DNA in a cell consists of 20% adenine, then it will also contain 20% thymine because adenine and thymine pair together.
This accounts for 40% of the DNA (20% adenine + 20% thymine).
The remaining 60% of the DNA must therefore be made up of cytosine and guanine.
Since cytosine pairs with guanine, the amount of cytosine should be equal to the amount of guanine.
Therefore, the DNA will contain 30% guanine (half of the remaining 60%).
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