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BIOA01H3 (698)
Lecture

Chapter 12 Introduction

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Department
Biological Sciences
Course
BIOA01H3
Professor
Mark Fitzpatrick
Semester
Fall

Description
Chapter 12: Central Dogma, Transcription & the genetic Code Question 1: Which of the following repair mechanism is most likely to be used in a cell that in not dividing? a. Proofreading b. Mismatch repair c. Excision repair Answer: c In excision repair, damaged nucleotides due to mutagen (ultraviolet radiation, X-ray) are recognized. Wrong nucleotides are excised and complementary nucleotide paired with the strand. This process happens in all cells, not just in DNA replication Proofreading & mismatch repair only occurs in DNA replication. Proofreading takes place before & mismatch repair takes place after DNA replication. Question 2: Of the proteins listed, which of these proteins binds to DNA earliest during DNA replication? a. Single stranded binding protein b. Ligase c. DNA polymerase III d. DNA polymerase I e. Telomerase Answer: a After helicase unzips the DNA strands, single
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