Campbell Biology in Focus
Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 13, Problem 8TYU
Summary Introduction

Introduction:

A student worked in the laboratory and conducted an experiment on the DNA replication process. The observation of the result included the formation of a normal strand paired with other segments of DNA a few hundred nucleotides long. The DNA replication involves the synthesis of leading strand and lagging strand by the enzyme DNA polymerase. The enzyme primase joins the individual fragments of the DNA to form the complete strand.

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Which statement about Okazaki fragments is true? Select one: a. DNA polymerase doesn’t need a primer to build these fragments    b. They act as a primer that initiates DNA replication.   c. They correct errors made during earlier phases of DNA replication.   d. They are necessary because DNA polymerase can only build DNA in the 5’ to 3’ direction, so for one of the strands at each fork, the DNA polymerase can only buildaway from the fork.    e. They prevent the ends of chromosomes from shortening with every replication.
A student mixes various molecule needed for DNA replication. When he adds DNA, replication occurs, but each DNA duplex consists of a normal DNA strand paired with numerous segments of DNA a few hundred nucleotides long. What has been left out of the mixture?   A. NTPs   B. DNA polymerase III     C. ATP     D. DNA polymerase I     E. DNA ligase
What can cause mutations in the DNA sequence? Select all that apply.   a.Exposure of cells to ionizing radiation   b.Failure of repair enzymes to recognize mismatched nucleotides before and during DNA replication   c.Recognition of mismatched bases by repair enzymes before and during DNA replication   d.Nucleotide errors occurring during DNA replication
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