Chapter 16 DNA Replication Quiz
Eukaryotic DNA and associated proteins that it wraps around
Chromatin
Bacterial chromosome that is circular and has associated proteins
Nucleiod
At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork: 3' C C T A G G C T G C A A T C C 5' An RNA primer is formed starting at the underlined T (T) of the template. Which of the following represents the primer sequence?
5' A C G U U A G G 3'
An Okazaki fragment has which of the following arrangements?
5' RNA nucleotides, DNA nucleotides 3'
In an analysis of the nucleotide composition of DNA, which of the following will be found
A + C = G + T
Joins the sugar phosphate backbones of Okazaki fragments
DNA Ligase
The process of making two DNA stands out of
DNA Replication
Separates the two stands of DNA by breaking the hydrogen bonds
DNA helicase
Replaces the primer with DNA nucleotides
DNA polymerase I
Adds new DNA nucleotides to the new DNA strand both lagging and leading
DNA polymerase III
A new DNA strand elongates only in the 5' to 3' direction because
DNA polymerase can only add nucleotides to the free 3' end.
Has many primers and is made in many pieces that must be put back together
Lagging strand
Utilizes only one primer and is made continuously
Leading strand
Short segments of DNA found on the lagging stand
Okazaki Fragments
Creates an RNA primer to start the process of replication
Primase (RNA polymerase)
The opening where DNA is being split by helicase
Replication Fork
An enzyme that adds nucleotides to the ends of chromosomes
Telomerase
The end of a eukaryotic chromosome
Telomeres
What is meant by the description "antiparallel" regarding the strands that make up DNA?
The 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand
If a cell were unable to produce histone proteins, which of the following would be a likely effect?
The cell's DNA couldn't be packed into its nucleus
Studies of nucleosomes have shown that histones (except H1) exist in each nucleosome as two kinds of tetramers: one of 2 H2A molecules and 2 H2B molecules, and the other as 2 H3 and 2 H4 molecules. Which of the following is supported by this data?
The two types of tetramers associate to form an octamer.
Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight. This occurs because their cells are impaired in what way?
They cannot repair thymine dimers
Releases tension on the DNA molecule up stream by breaking, swiveling and rejoining DNA
Topoisomerase
Eukaryotic telomeres replicate differently than the rest of the chromosome. This is a consequence of which of the following?
gaps left at the 5' end of the lagging strand
Proteins that DNA wraps around
histones
