If the amount of A is 30% in a strand of DNA, what will be the % of G?
From Wikipedia: "Chargaff's rules state that DNA from any cell of any organisms should have a 1:1 ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine should be equal to cytosine and the amount of adenine should be equal to thymine."
A pairs with T and G pairs with C.
So, the amount of thymine in the DNA will equal the amount adenine in the DNA, which will also be 30%. And the amount of guanine and cytosine will make up the remaining amount of DNA, which is 40%. Since guanine and cytosine just be in equal amounts, the answer is 20%.
Auto spell mistake, last sentence should read, Since guanine and cytosine must be in equal amounts, the answer is 20%. "
To determine the percentage of G in a strand of DNA, we need to consider Chargaff's rules. According to Chargaff's rules, in DNA:
- Adenine (A) always pairs with Thymine (T)
- Guanine (G) always pairs with Cytosine (C)
Since the given information states that the amount of A is 30%, we can assume that the amount of T is also 30% because of base pairing.
To find the percentage of G, we need to subtract the combined percentage of A and T from 100% (as the four nucleotides in DNA must add up to 100%).
So, the percentage of G can be calculated as follows:
100% - (percentage of A + percentage of T)
= 100% - (30% + 30%)
= 100% - 60%
= 40%
Therefore, the percentage of G in the strand of DNA will be 40%.