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Human Heredity: Principles and Iss...

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

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 8, Problem 10QP
Textbook Problem
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Adenine is a:

  1. a. nucleoside
  2. b. purine
  3. c. pyrimidine
  4. d. nucleotide
  5. e. base

Summary Introduction

Introduction: Nucleic acids are composed of a chain of nucleotides which has a backbone made up of sugar and bases. The backbone of DNA is made up of deoxyribose sugar and nitrogenous bases.

Explanation of Solution

Reason for correct answer:

Nucleic acids are composed of deoxyribose sugar and a nitrogenous base.  Adenine (A), guanine (G), cytosine (C), thymine (T), and uracil (U) are four types of nitrogenous bases. These nitrogenous bases are divided into two categories;

  • Pyrimidine: Cytosine (C), thymine (T), and uracil (U) (found in RNA only)
  • Purine: Adenine (A) and guanine (G)

These nitrogenous bases are paired with a specific base. Specific purine base is paired with a specific pyrimidine base.

Option b. is given as “purine” and option e is given as ‘base’.

Adenine is a nitrogenous base of purine category in the nucleic acid. Hence, the correct answer is option b and e...

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