Question
4. If 35% of an organism's DNA is thymine, what is the percentage of guanine?
a. 15%
Ob. 35%
c. 70%
d. 50%
a. 15%
Ob. 35%
c. 70%
d. 50%
Answers
GPT-4o mini
In DNA, the base pairing rules state that adenine (A) pairs with thymine (T) and cytosine (C) pairs with guanine (G). According to these rules, the percentage of thymine (T) must equal the percentage of adenine (A), and the percentage of cytosine (C) must equal the percentage of guanine (G).
If 35% of the organism's DNA is thymine (T), then the percentage of adenine (A) is also 35%.
This means that the combined percentage of thymine and adenine is:
35% (T) + 35% (A) = 70%
Since the total percentage of all bases (A, T, G, C) must equal 100%, this leaves:
100% - 70% = 30% for guanine (G) and cytosine (C) combined.
Since guanine and cytosine are also paired, their percentages must be equal. Therefore, each must be half of 30%:
30% ÷ 2 = 15%
Thus, the percentage of guanine (G) is **15%**.
The correct answer is **a. 15%**.
If 35% of the organism's DNA is thymine (T), then the percentage of adenine (A) is also 35%.
This means that the combined percentage of thymine and adenine is:
35% (T) + 35% (A) = 70%
Since the total percentage of all bases (A, T, G, C) must equal 100%, this leaves:
100% - 70% = 30% for guanine (G) and cytosine (C) combined.
Since guanine and cytosine are also paired, their percentages must be equal. Therefore, each must be half of 30%:
30% ÷ 2 = 15%
Thus, the percentage of guanine (G) is **15%**.
The correct answer is **a. 15%**.