Answered: Which statements are true? Explain why…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

Which statements are true? Explain why or why not.
1 The different cells in your body rarely have
genomes with the identical nucleotide sequence.
2 In E. coli, where the replication fork travels at 500
nucleotide pairs per second, the DNA ahead of the fork—
in the absence of topoisomerase—would have to rotate at
nearly 3000 revolutions per minute.
3 In a replication bubble, the same parental DNA
strand serves as the template strand for leading-strand
synthesis in one replication fork and as the template for
lagging-strand synthesis in the other fork.
4 When bidirectional replication forks from adja-
cent origins meet, a leading strand always runs into a lag-
ging strand.
5 DNA repair mechanisms all depend on the exis-
tence of two copies of the genetic information, one in each
of the two homologous chromosomes

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