CHз O.....H-NH N-H.....N Sugar Sugar Thymine Adenine н N-H…… N *H-N =N Sugar O.....H-NH *• •H–NH Sugar Cytosine Guanine

CHз O.....H-NH N-H.....N Sugar Sugar Thymine Adenine н N-H…… N H-N =N Sugar O.....H-NH • •H–NH Sugar Cytosine Guanine

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter11: Isolation Of Caffeine From Tea Le

Section: Chapter Questions

Problem 3Q

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Question

100%

The DNA double helix at the atomic level
looks like a twisted ladder, where the “rungs” of the ladder
consist of molecules that are hydrogen-bonded together.
Sugar and phosphate groups make up the sides of the ladder.
Shown are the structures of the adenine–thymine (AT)
“base pair” and the guanine–cytosine (GC) base pair:

You can see that AT base pairs are held together by two
hydrogen bonds and the GC base pairs are held together
by three hydrogen bonds. Which base pair is more stable to
heating? Why?

CHз
O.....H-NH
N-H.....N
Sugar
Sugar
Thymine
Adenine
н
N-H……
N *H-N
=N
Sugar
O.....H-NH
*• •H–NH
Sugar
Cytosine
Guanine

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