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Figure E21.22 shows the bonding of cytosine and guanine. The O—H and H—N distances are each 0.110 nm. In this case, assume that the bonding is due only to the forces along the O—H—O, N—H—N, and O—H—N combinations, and assume also that these three combinations are parallel to each other. Calculate the net force that cytosine exerts on guanine due to the preceding three combinations. Is this force attractive or repulsive?

Figure E21.22 shows the bonding of cytosine and guanine. The O—H and H—N distances are each 0.110 nm. In this case, assume that the bonding is due only to the forces along the O—H—O, N—H—N, and O—H—N combinations, and assume also that these three combinations are parallel to each other. Calculate the net force that cytosine exerts on guanine due to the preceding three combinations. Is this force attractive or repulsive?

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Figure E21.22 shows the bonding of cytosine and guanine. The O—H and H—N distances are each 0.110 nm. In this case, assume that the bonding is due only to the forces along the O—H—O, N—H—N, and O—H—N combinations, and assume also that these three combinations are parallel to each other. Calculate the
net force that cytosine exerts on guanine due to the preceding three combinations. Is this force attractive or repulsive?

 

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21.21 . BIO Base Pairing in DNA, I. The two sides of the DNA double helix are connected by pairs of bases (adenine, s thymine, cytosine, and guanine). Because of the geometric e shape of these molecules, adenine bonds with thymine and cyto- sine bonds with guanine. Figure E21.21 shows the bonding of Ithymine and adenine. Each charge shown is te, and the H-N t distance is 0.110 nm. (a) Calculate the net force that thymine sexerts on adenine. Is it attractive or repulsive? To keep the cal- culations 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 cach other. Remember, however, that in the 0-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 F of the bonding force of the electron in hydrogen with the bonding force of the adenine-thymine molecules. Figure E21.21 H 0.280 Thymine (H) Adenine (H 0.300 (H) pm H) 21.22 . BIO Base Pairing in DNA, II. Refer to Exercise 21.21. Figure E21.22 shows the bonding of cytosine and guanine. The O-Hand H-N distances are each 0.110 nm. In this case, assume that the bonding is due only to the forces along the O-H–0, N-H-N, and 0–H–N combinations, and assume also that these three combinations are parallel to cach other. Calculate the net force that cytosine exerts on guanine due to the preceding three combinations. Is this force attractive or repulsive? Figure E21.22 0.290 Guanine H) Cytosine 0.300 nm 0.290 nm H
Transcribed Image Text:21.21 . BIO Base Pairing in DNA, I. The two sides of the DNA double helix are connected by pairs of bases (adenine, s thymine, cytosine, and guanine). Because of the geometric e shape of these molecules, adenine bonds with thymine and cyto- sine bonds with guanine. Figure E21.21 shows the bonding of Ithymine and adenine. Each charge shown is te, and the H-N t distance is 0.110 nm. (a) Calculate the net force that thymine sexerts on adenine. Is it attractive or repulsive? To keep the cal- culations 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 cach other. Remember, however, that in the 0-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 F of the bonding force of the electron in hydrogen with the bonding force of the adenine-thymine molecules. Figure E21.21 H 0.280 Thymine (H) Adenine (H 0.300 (H) pm H) 21.22 . BIO Base Pairing in DNA, II. Refer to Exercise 21.21. Figure E21.22 shows the bonding of cytosine and guanine. The O-Hand H-N distances are each 0.110 nm. In this case, assume that the bonding is due only to the forces along the O-H–0, N-H-N, and 0–H–N combinations, and assume also that these three combinations are parallel to cach other. Calculate the net force that cytosine exerts on guanine due to the preceding three combinations. Is this force attractive or repulsive? Figure E21.22 0.290 Guanine H) Cytosine 0.300 nm 0.290 nm H
H 0.290 nm Guanine (H H H) Cytosine 0.300 H) nm H (N) (N 0.290 (N nm H N
Transcribed Image Text:H 0.290 nm Guanine (H H H) Cytosine 0.300 H) nm H (N) (N 0.290 (N nm H N
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