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Test 2

Posted: Tue Jul 23, 2019 11:49 am
by Jeril Joseph 1B
So, I got a question on test 2 wrong regarding the calculation of the maximum number of H-bonds DNA(specifically the adenine and thymine base) can form with water molecules. Whoever got this question right or understands it now, how do you go about solving this question?

Re: Test 2

Posted: Tue Jul 23, 2019 2:14 pm
by Yilun Ding
For the molecule on the left, each nitrogen atom with lone pair can form hydrogen bond with water, also each hydrogen bonded with nitrogen with partial positive charge (due to the electronegativity) will form hydrogen bond with oxygen atom in water. There are 5 nitrogen atoms with lone pair and partial negative charge, and there are 3 hydrogen atoms with partial positive can form hydrogen bond too. The same reason for the molecule on the right.