Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 12, DNA - Assessment - 13.3 Mutations - Understand Key Concepts/Think Critically - Page 387: 20



Work Step by Step

Option a. is incorrect. A toxin is a poisonous substance. Option c. is incorrect. Nitrogenous bases are components of amino acids. Option d. is incorrect. A nucleotide is a subunit of DNA. Option b. is correct. Mutagens are substances that cause mutations or changes in the DNA of an organism.
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