Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 18 - Genomics - Review Questions - Understand: 4



Work Step by Step

An ORF must have a place where cellular machinery can start to read and transcribe DNA (B.), which, in turn, requires a start codon. This disagrees with the answer in the book, which, in turn, disagrees with the text on p. 362, upper left hand column--books sometimes contain errors. A stop codon (A.) is not necessarily required since the machinery will read DNA without it, and the sequence need not be a given length (C.). Since A. and C. are wrong, so it D. If you do accept that the stop codon and a certain length (A. and C.) are required, then D. is the correct answer, as the book says.
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