STEM Lessons for College Students

21.21 .. BIO Base Pairing in DNA I. 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. Figure E21.21 shows the bonding of thymine and adenine. Each charge shown is {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.

University Physics with Modern Physics lessons by JJtheTutor. Designed to teach students problem solving skills.

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Question source: “University Physics with Modern Physics by Hugh Young and Roger Freedman

University Physics with Modern Physics lessons by JJtheTutor. Designed to teach students problem solving skills, test taking skills and how to understand the concepts.

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