Question 1

Which statement about the structure or composition of DNA is FALSE?

Accepted Answer

A) DNA is a double helix. 
B) Complementary base-pairing occurs between pyrimidine and purine bases. 
C) The amount of thymine closely approximates that of guanine within a particular organism. 
D) Each nucleotide within a DNA is separated by about 0.34 angstroms. 
E) Adenine pairs with thymine and guanine with cytosinE. 
A) DNA is a double helix. 
B) Complementary base-pairing occurs between pyrimidine and purine bases. 
C) The amount of thymine closely approximates that of guanine within a particular organism. 
D) Each nucleotide within a DNA is separated by about 0.34 angstroms. 
E) Adenine pairs with thymine and guanine with cytosinE. C

Question 2

Which is not a pyrimidine?

Accepted Answer

A) adenine 
B) thymine 
C) cytosine 
D) uracil 
E) cytosine and thymine 
A) adenine 
B) thymine 
C) cytosine 
D) uracil 
E) cytosine and thymine A

Question 3

All of these are critical factors for DNA replication on the leading strand EXCEPT

Accepted Answer

A) primer 
B) DNA ligase 
C) DNA polymerase 
D) DNA primase 
E) deoxynucleoside triphosphates 
A) primer 
B) DNA ligase 
C) DNA polymerase 
D) DNA primase 
E) deoxynucleoside triphosphates B

Question 4

A DNA specimen that contains 30% guanine contains how much thymine?

Accepted Answer

A) 15% 
B) 20% 
C) 30% 
D) 60% 
E) The amount of thymine cannot be determined. 
A) 15% 
B) 20% 
C) 30% 
D) 60% 
E) The amount of thymine cannot be determined.

Question 5

What can be said about the leading versus the lagging strand in DNA population?

Accepted Answer

A) The leading strand is replicated continuously for the entire length of the chromosome,while the lagging strand is replicated in pieces. 
B) The lagging strand is synthesized in a semiconservative fashion while the leading strand is synthesized in a conservative fashion 
C) Synthesis of the lagging strand requires more helicase enzymes than synthesis of the leading strand. 
D) The lagging strand has a higher mutation rate than the leading strand 
A) The leading strand is replicated continuously for the entire length of the chromosome,while the lagging strand is replicated in pieces. 
B) The lagging strand is synthesized in a semiconservative fashion while the leading strand is synthesized in a conservative fashion 
C) Synthesis of the lagging strand requires more helicase enzymes than synthesis of the leading strand. 
D) The lagging strand has a higher mutation rate than the leading strand

Question 6

Without the work of Rosalind Franklin,Watson and Crick would not have known

Accepted Answer

A) which nucleotides could pair together. 
B) how many strands of DNA made up the molecule. 
C) the shape of the molecule. 
D) the width of the molecule. 
E) nucleotide pairs,number of strands,molecular shape,and molecular width. 
A) which nucleotides could pair together. 
B) how many strands of DNA made up the molecule. 
C) the shape of the molecule. 
D) the width of the molecule. 
E) nucleotide pairs,number of strands,molecular shape,and molecular width.

Question 7

If there is 28% adenine,then there must be 28% cytosine for the DNA composition of a particular organism.

Accepted Answer

A) True 
 B)False

Question 8

In order to produce a single strand of DNA the nucleotides combine to form what type of bond?

Accepted Answer

A) hydrogen 
B) peptide 
C) phosphodiester 
D) purine 
E) ionic 
A) hydrogen 
B) peptide 
C) phosphodiester 
D) purine 
E) ionic

Question 9

How many replication forks are there at an origin of replication?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 10

Which of these proteins-functions is mismatched?

Accepted Answer

A) DNA polymerase..........DNA synthesis 
B) DNA polymerase..........primer removal and replacement with DNA 
C) DNA primase..........production of RNA primer 
D) topoisomerase..........separates double-stranded DNA into single strands 
E) single-stranded binding proteins..........prevents single DNA strands from reforming into a double helix 
A) DNA polymerase..........DNA synthesis 
B) DNA polymerase..........primer removal and replacement with DNA 
C) DNA primase..........production of RNA primer 
D) topoisomerase..........separates double-stranded DNA into single strands 
E) single-stranded binding proteins..........prevents single DNA strands from reforming into a double helix

Question 11

Which characteristic of genetic material accounts for the need to get a flu vaccine every year,but a polio vaccine once in a life time?

Accepted Answer

A) Information 
B) Replication 
C) Transmission 
D) Replication and Transmission 
E) Variation 
A) Information 
B) Replication 
C) Transmission 
D) Replication and Transmission 
E) Variation

Question 12

Which characteristic of genetic material accounts for the phenomenon of natural selection?

Accepted Answer

A) Information 
B) Replication 
C) Transmission 
D) Replication and Transmission 
E) Variation 
A) Information 
B) Replication 
C) Transmission 
D) Replication and Transmission 
E) Variation

Question 13

What is the highest (or most complex)level of structure for genetic material?

Accepted Answer

A) nucleotide 
B) double helix 
C) DNA 
D) gene 
E) chromosome 
A) nucleotide 
B) double helix 
C) DNA 
D) gene 
E) chromosome

Question 14

Bacteria are grown in 15N (heavy)medium and then transferred to 14N (light)medium and are allowed to replicate for 1 generation.The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?

Accepted Answer

A) one heavy band 
B) one light band 
C) one half-heavy (intermediate to heavy and light)band 
D) one heavy and one half-heavy band 
E) one heavy and one light band 
A) one heavy band 
B) one light band 
C) one half-heavy (intermediate to heavy and light)band 
D) one heavy and one half-heavy band 
E) one heavy and one light band

Question 15

What was one of the pieces of evidence most critical to the discovery of DNA structure?

Accepted Answer

A) its composition of four different nucleotides 
B) its mode of replication 
C) an X-ray diffraction pattern suggesting a double helix shape 
D) the backbone containing sugar-phosphate linkages 
E) the covalent bonding between different nucleotides 
A) its composition of four different nucleotides 
B) its mode of replication 
C) an X-ray diffraction pattern suggesting a double helix shape 
D) the backbone containing sugar-phosphate linkages 
E) the covalent bonding between different nucleotides

Question 16

This produces short sequences of RNA,which allows polymerase to synthesize a new strand of DNA.

Accepted Answer

A) DNA primase 
B) DNA helicase 
C) DNA polymerase 
D) DNA topoisomerase 
E) DNA ligase 
A) DNA primase 
B) DNA helicase 
C) DNA polymerase 
D) DNA topoisomerase 
E) DNA ligase

Question 17

A strand of DNA is composed of nucleotide bases,sulfate groups,and sugars.

Accepted Answer

A) True 
 B)False

Question 18

Which of these statements is FALSE?

Accepted Answer

A) One chromosome is made up of many DNA molecules 
B) A eukaryotic genome is made up of many DNA molecules 
C) A DNA double helix is composed of both covalent bonds and hydrogen bonds 
D) A strand of DNA is made up of many nucleotides 
A) One chromosome is made up of many DNA molecules 
B) A eukaryotic genome is made up of many DNA molecules 
C) A DNA double helix is composed of both covalent bonds and hydrogen bonds 
D) A strand of DNA is made up of many nucleotides

Question 19

The nucleotides within DNA are composed of a

Accepted Answer

A) phosphate group,ribose sugar,and nitrogenous base. 
B) sulfur group,ribose sugar,and nitrogenous base. 
C) phosphate group,deoxyribose sugar,and nitrogenous base. 
D) sulfur group,deoxyribose sugar,and nitrogenous base. 
E) phosphate group,hexose sugar,and nitrogenous basE. 
A) phosphate group,ribose sugar,and nitrogenous base. 
B) sulfur group,ribose sugar,and nitrogenous base. 
C) phosphate group,deoxyribose sugar,and nitrogenous base. 
D) sulfur group,deoxyribose sugar,and nitrogenous base. 
E) phosphate group,hexose sugar,and nitrogenous basE.

Question 20

DNA helicase and topoisomerase are similar insofar as they promote the unwinding and uncoiling of DNA.

Accepted Answer

A) True 
 B)False

Exam 9: Nucleic Acid Structure, DNA Replication, and Chromosome Structure

Which statement about the structure or composition of DNA is FALSE?

Which is not a pyrimidine?

All of these are critical factors for DNA replication on the leading strand EXCEPT

A DNA specimen that contains 30% guanine contains how much thymine?

What can be said about the leading versus the lagging strand in DNA population?

Without the work of Rosalind Franklin,Watson and Crick would not have known

If there is 28% adenine,then there must be 28% cytosine for the DNA composition of a particular organism.

In order to produce a single strand of DNA the nucleotides combine to form what type of bond?

How many replication forks are there at an origin of replication?

Which of these proteins-functions is mismatched?

Which characteristic of genetic material accounts for the need to get a flu vaccine every year,but a polio vaccine once in a life time?

Which characteristic of genetic material accounts for the phenomenon of natural selection?

What is the highest (or most complex)level of structure for genetic material?

Bacteria are grown in 15N (heavy)medium and then transferred to 14N (light)medium and are allowed to replicate for 1 generation.The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?

What was one of the pieces of evidence most critical to the discovery of DNA structure?

This produces short sequences of RNA,which allows polymerase to synthesize a new strand of DNA.

A strand of DNA is composed of nucleotide bases,sulfate groups,and sugars.

Which of these statements is FALSE?

The nucleotides within DNA are composed of a

DNA helicase and topoisomerase are similar insofar as they promote the unwinding and uncoiling of DNA.

An Introduction to Biology

The Chemical Basis of Life I: Atoms, Molecules, and Water

The Chemical Basis of Life II: Organic Molecules

General Features of Cells

Membrane Structure, Transport, and Cell Junctions

Energy, Enzymes, and Cellular Respiration

Photosynthesis

Cell Communication

Gene Expression at the Molecular Level

Gene Regulation

Mutation, DNA Repair, and Cancer

The Eukaryotic Cell Cycle, Mitosis, and Meiosis

Patterns of Inheritance

Genetics of Viruses and Bacteria

Genetic Technology

Genomes, Repetitive Sequences, and Bioinformatics

Origin and History of Life

An Introduction to Evolution and Population Genetics

Origin of Species and Macroevolution

Taxonomy and Systematics

Microorganisms: The Archaea, Bacteria, and Protists

Plants

Fungi

Animal Diversity: Invertebrates

Animal Diversity: Vertebrates

An Introduction to Flowering Plant Form and Function

Flowering Plants: Plant Behavior

Flowering Plants: Nutrition and Transport

Flowering Plants: Reproduction

Animal Bodies and Homeostasis

Neuroscience I: Structure, Function, and Evolution of Nervous Systems

Neuroscience II: Sensory Systems

Muscular-Skeletal Systems

Digestive Systems and Nutrition

Circulatory Systems

Respiratory Systems

Excretory Systems and the Homeostasis of Internal Fluids

Endocrine Systems

Animal Reproduction and Development

Immune Systems

Animal Behavior

Ecology and the Physical Environment

Population Ecology

Community Ecology

Ecosystem Ecology

Biodiversity and Conservation Biology

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Bacteria are grown in ¹⁵N (heavy)medium and then transferred to ¹⁴N (light)medium and are allowed to replicate for 1 generation.The DNA is subsequently isolated and centrifuged in a CsCl₂ gradient to yield what type of gradient band(s)?