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16.12.2020 •
Biology
If a double-stranded segment of DNA has been found to have 23 purines and 15 thymines, how many guanines are there?
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Ответ:
4 Guanines
Explanation: Following Chargaff's ratio that describes the ration of purines to pyrimidines as 1:1, if there are 23 purines, it follows that there should be 23 pyrimidines; 15 Thymines should therefore be hydrogen bonded to 15 Adenines by complementary base pairing.
We are then left with 8 nucleotides composed of guanines and cytosines in complementary base pairs. This means that half that number (4) should be guanines and the rest cytosines.
Ответ:
Solar energy, Wind energy, Geothermal energy, Hydroelectric energy.
Explanation:
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