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BIO 121-01

Study Guide

QuestionAnswer
Helicase Unwinds parental double helix at replication forks
Single-strand binding protein Bins to and stabilizes single-strand DNA until it is used as a stemplate
Topoisomerase Relives overwinding strain ahead of replication forks by breaking, swiveling, and rejoining DNA strands
Primase Synthesizes and RNA primer at 5' end of the leading strand and at 5' end of each okazaki fragment of lagging strand
DNA pol III Using parental DNA as a template, synthesizes new DNA strand by adding nucleotides to an RNA primer or a pre-existing DNA strand
DNA pol I Removes RNA nucleotides of promer from 5' end and replaces them with DNA nucleotides added to 3' end of sdjacent fragment
DNA ligase Joins Okazaki fragments of lagging strand; on leading strand joins 3' end of DNA that replaces primer to rest of leading strand DNA
Telomeres The special nucleotide sequences at the end of Eukaryotic chromosomal DNA
Chromatin DNA combined with proteins in a complex
Nucleosome The basic unit of DNA packing
Created by: Kaylasilden