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BIOL308 Study Guide - Final Guide: Associative Property, Heterochromatin, Prokaryote

4 pages86 viewsSpring 2018

Course Code
Dragana Miskovic
Study Guide

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1. List proteins (enzymes and other factors) involved in the process of DNA
replication in E. coli. Explain the role of each of these proteins in replication.
Dna-a recognizes ori-c, binds to 4 9 bp boxes and opens strand at 3 13 bp boxes, initiates
Dna-b helicase, moves along strand and seperates them
DNa-c - loads dna-b onto the stand
Ssb bind to single stands to keep them from rejoining
Dna pol I removes nucleotide errors and replaces gaps
Primase synthesizes rna primers for initiation of replication on both strand
DNA pol III synthesizes new dna strand
Ligase joins okazagi fragments together
RNase h involved in removal of primer
Topoisomerases regulate supercoiling
2. What is meant by replication being bidirectional? Semiconservative?
Continuous and discontinuous?
Bidirectional means it moves in both directions from origin of replication, on both
strands, one strand being continonus from origin in one way, discontinuous in the
other direction.
Semiconservative, each replicated strand has one new strand and one parent strand
Continous meaning that once dna pol III stards building off of RNA primer, it will
continue until strand is completed, there are no gaps or breaks
Discontinuous, several rna primers made on other strand, followed by dna strands,
rna removed and gaps are filled
3. Contrast the role of DNA polymerase I and III in E. coli DNA replication.
DNA polymerase is involved in removal of rna primers and filling with dNTPs, DNA
polymerase III catalyzes the synthesis of the DNA strand from an RNA template.
4. Which subunit of DNA polymerase III provides processivity? Which protein
complex loads this subunit onto the DNA?
The beta clamp provides processicity. Processivity means that the polymerase will
continue replicating and going along strand until it ends or it is unloaded. The alpha
gamma subunit loads it onto dna.
5. How can discontinuos synthesis of the lagging strand keep up with
continuous synthesis of the leading strand?
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