The two sides of the DNA double helix are con cytosine, and guanine). Because of the geo bonds with thymine and cytosine bonds with g of thymine and adenine. Each charge shown nm. (a) Calculate the net force that thymine exerts keep the calculations fairly simple, yet reasona

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The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine,
cytosine, and guanine). Because of the geometric shape of these molecules, adenine
bonds with thymine and cytosine bonds with guanine. The figure below shows the bonding
of thymine and adenine. Each charge shown is +e or - e, and the H-N distance is 0.110
nm.
(a) Calculate the net force that thymine exerts on adenine. Is it attractive or repulsive? To
keep the calculations fairly simple, yet reasonable, consider only the forces due to the O-
H-N and the N-H-N combinations, assuming that these two combinations are parallel
to each other. Remember, however, that in the O-H-N set, the O- exerts a force on both
the H+ and the N-, and likewise along the N–H-N set.
(b) Calculate the force on the electron in the hydrogen atom, which is 0.0529 nm from the
proton. Then compare the strength of the bonding force of the electron in hydrogen with
the bonding force of the adenine-thymine molecules
(H
(H
(H)
0.280
(H
nm
Thymine
(H)
Adenine
(N)
(N
(H
0.300
(H)
nm
(H)
(N)
(N)
(N)
(N)
(H)
Transcribed Image Text:The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytosine bonds with guanine. The figure below shows the bonding of thymine and adenine. Each charge shown is +e or - e, and the H-N distance is 0.110 nm. (a) Calculate the net force that thymine exerts on adenine. Is it attractive or repulsive? To keep the calculations fairly simple, yet reasonable, consider only the forces due to the O- H-N and the N-H-N combinations, assuming that these two combinations are parallel to each other. Remember, however, that in the O-H-N set, the O- exerts a force on both the H+ and the N-, and likewise along the N–H-N set. (b) Calculate the force on the electron in the hydrogen atom, which is 0.0529 nm from the proton. Then compare the strength of the bonding force of the electron in hydrogen with the bonding force of the adenine-thymine molecules (H (H (H) 0.280 (H nm Thymine (H) Adenine (N) (N (H 0.300 (H) nm (H) (N) (N) (N) (N) (H)
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