Biology (Raven), 9th Edition

Chapter 14: DNA: The Genetic Material

Post-Test

1
Which of these is NOT involved with excision-repair of damaged DNA?
A)The UvrABC complex.
B)Recognition of damage.
C)Removal of damage region.
D)Resynthesis using the information on the undamaged strand as a template.
E)All of these are involved with excision-repair of damaged DNA.
2
The three parts of each nucleotide are
A)Cytosine, ribose, and phosphate.
B)Amino group, phosphate, and pentose sugar.
C)Phosphate, ribose, and nitrogenous base.
D)Nitrogenous base, phosphate, and pentose sugar.
E)Pentose, cytosine, and phosphate.
3
A eukaryotic chromosome has multiple origins of replication.
A)True
B)False
4
Screening consumer products for potential mutagens
A)demonstrates that most mutagens operate on DNA using similar chemical mechanisms of action.
B)reduces natural sources of mutation.
C)means that organic food and products are unlikely to cause DNA damage.
D)eliminates sources of mutation except for ultraviolet light.
E)only reduces the load of mutagens we are exposed to, but does not eliminate them.
5
What functional group is found at the 5' end of a DNA strand?
A)a phosphate group.
B)a hydroxyl group.
C)a carbonyl group.
D)a deoxyribose sugar.
E)a carboxyl group
6
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
A)sugars.
B)paired bases.
C)phosphates.
D)a sugar and a phosphate molecule.
E)sulfur bonds.
7
If 30% of an organism's DNA is thymine, then
A)70% is deoxyribose.
B)20% is guanine.
C)30% is adenine.
D)20% is guanine, and 30% is adenine.
E)50% is guanine
8
In a DNA molecule, the
A)bases are covalently bonded to one another.
B)sugars are composed of 8 carbon rings.
C)bases are hydrogen bonded to one another.
D)nucleotides are hydrogen bonded to one another.
E)All of the choices are correct.
9
Which of the following contains thymine?
A)DNA
B)mRNA
C)rRNA
D)protein
E)tRNA
10
Whose research suggested that the DNA molecule has the shape of a helix, or Corkscrew?
A)James Watson
B)Francis Crick
C)Matthew Meselson
D)Franklin Stahl
E)Rosalind Franklin
11
Which of the following is NOT true about DNA?
A)It has the structure of a double helix.
B)Bases between the two strands are held together by hydrogen bonds.
C)Bases are complementary to each other.
D)DNA incorporates a deoxyribose sugar.
E)DNA contains adenine, guanine, cytosine, and uracil.
12
During DNA replication,
A)each base forms hydrogen bonds with a complementary base.
B)each base forms hydrogen bonds with the same type of base.
C)bases do not form hydrogen bonds.
D)uracil bonds with adenine.
E)ribose sugars bond with complementary bases.
13
The enzyme that joins DNA complementary nucleotides together is
A)DNA polymerase.
B)RNA polymerase.
C)helicase.
D)ribozyme.
E)lipase.
14
If one strand of DNA has the base sequence ATCGTA, what will the complementary strand have?
A)TAGCAT
B)ATCGTA
C)CAGTCT
D)ATGCTA
E)UAGCAU
15
Research indicates a relationship between cell aging and
A)Polymerase activity.
B)Helicase activity.
C)The size of the replication complex.
D)Priming mistakes.
E)Telomere length.
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