Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 13 - DNA and Its Role in Heredity - 13.3 - DNA Is Replicated Semiconservatively - 13.3 Recap - Learning Outcomes - Page 282: 2

Answer

Primase: synthesizes one nucleotide at a time DNA polymerase: elongates the new DNA strand at a replication fork and adds consecutive nucleotides to the growing DNA strand DNA helicase: uses ATP to separate the DNA strands, making each of the 2 template strands available for base pairing. DNA ligase: glues the Okazaki fragments and makes the lagging strand whole Telomerase: catalyzes the addition of lost telomeric sequences in these cells. It contains an RNA sequence template for the telomeric DNA repeat sequence.

Work Step by Step

Primase: synthesizes one nucleotide at a time DNA polymerase: elongates the new DNA strand at a replication fork and adds consecutive nucleotides to the growing DNA strand DNA helicase: uses ATP to separate the DNA strands, making each of the 2 template strands available for base pairing. DNA ligase: glues the Okazaki fragments and makes the lagging strand whole Telomerase: catalyzes the addition of lost telomeric sequences in these cells. It contains an RNA sequence template for the telomeric DNA repeat sequence.
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