20 terms

Chapter 14

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If adenine (A) is located on the leading strand of DNA, then the same location on the lagging strand 2 must be
Thymine
What are the paired bases in DNA
adenine-thymine; guanine-cytosine
In DNA the n=amount of adenine is always equal to the amount of
Guanine
The reason the amount of A=T and G=C ("Chargaff's Rule") is because
purines base-pair with pyrimidines
Formation of a replication fork results in
buildup of torsion in the DNA upstream of the fork
What is involved in the excision-repair of damaged DNA
~The UvrABC complex
~Recognition of damage
~Removal of damage region
~Resynthesis using the information on the undamaged strand as a template
The three parts of each nucleotide are
Nitrogenous base, phosphate, and pentose sugar
A eukaryotic chromosome has multiple origins of replication True or False
True
Screening consumer products for potential mutagens
only reduces the load of mutagens we are exposed to, but does not eliminate them completely
What functional group is found at the 5' end of a DNA strand
A hydroxyl group
In the Watson-Crick model of the DNA double helix. the molecules have the appearance of a twisted ladder. The "steps" or "rungs" of the ladder are composed of
paired bases
If 30% of an organism's DNA is thymine, then
30% is also adenine
In a DNA molecule, the bases are
hydrogen bonded to one another
which of the following contains thymine; DNA, mRNA, rRNA, protein, or tRNA
DNA
whose research suggested that the DNA molecule has teh shape of a helix, or corkscrew
Rosalind Franklin
name 4 characteristics of DNA
~It has teh structure of a double helix
~Bases between the two strands are held together by hydrogen bonds
~Bases are complementary to each other
~DNA incorporates a deoxyribose sugar
During DNA replication each base
Forms a hydrogen bond with a complementary base
The enzyme that joins DNA complementary nucleotides together is
a DNA polymerase
If one strand of DNA has the base sequence of ATCGTA what is the complementary strand
TAGCAT
Research indicates a relationship between cell aging and
Telomere length