Answered: CHз O.....H-NH N-H.....N Sugar Sugar…

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter23: The Chemistry Of Life

Section: Chapter Questions

Problem 43A

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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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