Biology 2010 Student Edition

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

Chapter 12, DNA - Assessment - 13.2 Ribosomes and Protein Synthesis - Understand Key Concepts/Think Critically - Page 386: 9

Answer

d.

Work Step by Step

The number of codons is specified by the possible combinations of the four nitrogenous bases adenine, uracil, cytosine, and guanine. The possible three-letter combinations that can be made is, therefore, 64. Although 64 codons are possible, there are only 20 amino acids because several codons are used as start codons, several are used as stop codons, and several combinations can code for the same amino acid.
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