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A beginning genetics student is attempting to complete an assignment to draw a base pair from a DNA molecule. The drawing is incomplete, and the student does not know how to finish. He asks for your advice. The assignment sheet shows that the drawing is to contain three hydrogen bonds, a purine, and a pyrimidine. From your knowledge of the pairing rules and the number of hydrogen bonds in A/T and G/C base pairs, what base pair do you help the student draw?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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Chapter
Section
BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 8, Problem 16QP
Textbook Problem
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A beginning genetics student is attempting to complete an assignment to draw a base pair from a DNA molecule. The drawing is incomplete, and the student does not know how to finish. He asks for your advice. The assignment sheet shows that the drawing is to contain three hydrogen bonds, a purine, and a pyrimidine. From your knowledge of the pairing rules and the number of hydrogen bonds in A/T and G/C base pairs, what base pair do you help the student draw?

Summary Introduction

To determine: The structure of a DNA molecule that consists of three hydrogen bonds, a purine, and a pyrimidine when an individual has the knowledge of base pairing rules and the number of hydrogen bonds between A/T and G/C base pairs.

Introduction: Watson and Crick used the information of Chargaff’s rule to build their DNA model. According to Chargaff’s rule, the base pairing in DNA is highly specific. Adenine (A) always pairs with thymine (T) and guanine (G) always pairs with cytosine (C). Hydrogen bonds link A to T and G to C.

Explanation of Solution

The double-stranded DNA replicates itself during cell division. DNA is separated into two strands first and acts as a template to synthesize the complementary DNA. Once DNA strands get separated, DNA polymerase adds new nucleotides to form a copy of template DNA. Nucleotides contain nitrogenous bases which are linked covalently with the sugar molecule.

Nitrogenous bases pair with specific bases to form a new strand of DNA molecule...

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