Question 1

Which class of proteins is associated with DNA in chromatin?

Accepted Answer

A)  Histones 
B)  Non-histone chromosomal proteins 
C)  Enzymes 
D)  Histones and Non-histone chromosomal proteins 
E)  All of these 
A)  Histones 
B)  Non-histone chromosomal proteins 
C)  Enzymes 
D)  Histones and Non-histone chromosomal proteins 
E)  All of these

Question 2

Which of the following characteristics or functions is not believed to be exhibited by highly repetitive DNA?

Accepted Answer

A)  Structural or organizational roles for the chromosome. 
B)  Transposable elements 
C)  Heterochromatin 
D)  Influencing regions of chromosome pairing 
E)  Junk 
A)  Structural or organizational roles for the chromosome. 
B)  Transposable elements 
C)  Heterochromatin 
D)  Influencing regions of chromosome pairing 
E)  Junk

Question 3

Underwound DNA is said to exhibit:

Accepted Answer

A)  Positive supercoiling 
B)  Negative supercoiling 
C)  Positive relaxation 
D)  Negative relaxation 
E)  None of these 
A)  Positive supercoiling 
B)  Negative supercoiling 
C)  Positive relaxation 
D)  Negative relaxation 
E)  None of these

Question 4

Which of the following is a type of nucleic acid?

Accepted Answer

A)  DNA 
B)  RNA 
C)  DNAse 
D)  RNAse 
E)  DNA and RNA 
A)  DNA 
B)  RNA 
C)  DNAse 
D)  RNAse 
E)  DNA and RNA

Question 5

Which of the following materials was used by Avery,McLeod,and McCarty in their experimentation to identify the transforming agent?

Accepted Answer

A)  DNAse 
B)  RNAse 
C)  Protease 
D)  RNAse and Protease 
E)  All of these 
A)  DNAse 
B)  RNAse 
C)  Protease 
D)  RNAse and Protease 
E)  All of these

Question 6

In Sia and Dawson's 1931 experiment:

Accepted Answer

A)  Mice were required to demonstrate the transforming principle 
B)  Used serum to precipitate IIIS cells from a mixture of heat-killed IIIS and living IIR cells 
C)  They showed that mice play no direct role in the transforming principle 
D)  Heat-killed IIR cells mixed with living IIIS cells gave rise to IIR colonies 
E)  None of these 
A)  Mice were required to demonstrate the transforming principle 
B)  Used serum to precipitate IIIS cells from a mixture of heat-killed IIIS and living IIR cells 
C)  They showed that mice play no direct role in the transforming principle 
D)  Heat-killed IIR cells mixed with living IIIS cells gave rise to IIR colonies 
E)  None of these

Question 7

The pathogenic effects of viroids are thought to result from:

Accepted Answer

A)  The ability to alter normal patterns of gene expression 
B)  The ability to directly mutate DNA 
C)  The ability to indirectly mutate RNA 
D)  The ability to stop gene expression 
E)  The ability to enhance gene expression 
A)  The ability to alter normal patterns of gene expression 
B)  The ability to directly mutate DNA 
C)  The ability to indirectly mutate RNA 
D)  The ability to stop gene expression 
E)  The ability to enhance gene expression

Question 8

Infectious agents that contain small circular pieces of RNA that are not packaged in a protein coat are known as:

Accepted Answer

A)  Prions 
B)  Viruses 
C)  Bacteria 
D)  Viroids 
E)  Protisits 
A)  Prions 
B)  Viruses 
C)  Bacteria 
D)  Viroids 
E)  Protisits

Question 9

The technique for visualizing large chromosomes using [³H] thymidine-labeled DNA on protein coated glass slides is called:

Accepted Answer

A)  Pulse-field gel electrophoresis 
B)  Autoradiography 
C)  Viscoelastometry 
D)  DNA sequencing 
E)  RFLP 
A)  Pulse-field gel electrophoresis 
B)  Autoradiography 
C)  Viscoelastometry 
D)  DNA sequencing 
E)  RFLP

Question 10

Which of the following statements concerning DNA structure is incorrect?

Accepted Answer

A)  The two strands of a double helix are complementary and anti-parallel 
B)  he structure was first predicted by Watson and Crick in 1953 to be arranged as a double-stranded helix. 
C)  The final structure disproved the work leading to Chargaff's rule. 
D)  X-ray diffraction patterns indicated a double-stranded structure with repeating substructure every 0.34 nm 
E)  None of these 
A)  The two strands of a double helix are complementary and anti-parallel 
B)  he structure was first predicted by Watson and Crick in 1953 to be arranged as a double-stranded helix. 
C)  The final structure disproved the work leading to Chargaff's rule. 
D)  X-ray diffraction patterns indicated a double-stranded structure with repeating substructure every 0.34 nm 
E)  None of these

Question 11

Prokaryotic chromosome structure:

Accepted Answer

A)  Is in a loosely condensed state in vivo called the "folded genome" 
B)  Has 50 to 100 domains or loops, each of which is independently negatively supercoiled 
C)  Consists only of DNA and protein 
D)  Is unaffected by RNAse treatment 
E)  Is unorganized as a "naked molecule of DNA" 
A)  Is in a loosely condensed state in vivo called the "folded genome" 
B)  Has 50 to 100 domains or loops, each of which is independently negatively supercoiled 
C)  Consists only of DNA and protein 
D)  Is unaffected by RNAse treatment 
E)  Is unorganized as a "naked molecule of DNA"

Question 12

Satellite DNA is

Accepted Answer

A)  Repetitive 
B)  Randomly located throughout the genome 
C)  Prokaryotic 
D)  Expressed 
E)  None of these 
A)  Repetitive 
B)  Randomly located throughout the genome 
C)  Prokaryotic 
D)  Expressed 
E)  None of these

Question 13

Infectious agents that contain only altered forms of protein and no nucleic acid are known as:

Accepted Answer

A)  Prions 
B)  Viruses 
C)  Bacteria 
D)  Viroids 
E)  Protists 
A)  Prions 
B)  Viruses 
C)  Bacteria 
D)  Viroids 
E)  Protists

Question 14

Which of the following is true regarding the structure of DNA?

Accepted Answer

A)  Double stranded molecule 
B)  Single stranded molecule 
C)  Composed of nucleotides 
D)  Double stranded molecule and Composed of nucleotides 
E)  Single stranded molecule and Composed of nucleotides 
A)  Double stranded molecule 
B)  Single stranded molecule 
C)  Composed of nucleotides 
D)  Double stranded molecule and Composed of nucleotides 
E)  Single stranded molecule and Composed of nucleotides

Question 15

Which of the following are essential functions that the genetic material must perform?

Accepted Answer

A)  Replication, mutation, gene expression 
B)  Replication, adaptation, mutation 
C)  Transcription, translation, storage 
D)  Transcription, translation, replication 
E)  None of these 
A)  Replication, mutation, gene expression 
B)  Replication, adaptation, mutation 
C)  Transcription, translation, storage 
D)  Transcription, translation, replication 
E)  None of these

Question 16

Hershey and Chase used radiolabeled T2 phages to identify which component of the phage entered E.coli during infection.Which of the following matches the radiolabel with the appropriate phage component?

Accepted Answer

A)  ³²P DNA, 35S Protein 
B)  ³²P Protein, 35S RNA 
C)  ³²P RNA, 35S DNA 
D)  ³²P Protein, 35S DNA 
E)  ³²P Protein, 35S Protein 
A)  ³²P DNA, 35S Protein 
B)  ³²P Protein, 35S RNA 
C)  ³²P RNA, 35S DNA 
D)  ³²P Protein, 35S DNA 
E)  ³²P Protein, 35S Protein

Question 17

How does mutation allow an organism to evolve? 1.Changes in the genetic material allow organisms to adapt to modifications in the environment
2)Changes in the genetic material allow organisms to survive in limited types of environment
3)Mutations do not allow an organism to evolve

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  2 and 
A)  1 
B)  2 
C)  3 
D)  1 and 2 
E)  2 and

Question 18

According to the unineme model of chromosomal structure,how many double stranded DNA molecules run parallel throughout a eukaryotic chromosome?

Accepted Answer

A)  One 
B)  Two 
C)  Three 
D)  Four 
E)  Five 
A)  One 
B)  Two 
C)  Three 
D)  Four 
E)  Five

Question 19

RNA was first identified as the genetic material of the tobacco mosaic virus (TMV)through an experiment in which:

Accepted Answer

A)  Protein and nucleic acid were radioactively labeled 
B)  Protein, RNA, and DNA were digested using various enzymes 
C)  The protein coats and RNA from two distinctive TMV strains were exchanged 
D)  RNA underwent CsCl density-dependent centrifugation 
E)  None of these 
A)  Protein and nucleic acid were radioactively labeled 
B)  Protein, RNA, and DNA were digested using various enzymes 
C)  The protein coats and RNA from two distinctive TMV strains were exchanged 
D)  RNA underwent CsCl density-dependent centrifugation 
E)  None of these

Question 20

Before direct proof of DNA being the genetic material,indirect evidence suggesting DNA as the appropriate macromolecule,included

Accepted Answer

A)  Gametes have 1/2 the amount of DNA as somatic cells 
B)  Molecular composition of DNA is the same in different cells of an organism, whereas RNA and protein contents vary 
C)  A correlation between DNA content and the number of chromosome sets per cell 
D)  DNA is more stable than RNA or protein 
E)  All of these 
A)  Gametes have 1/2 the amount of DNA as somatic cells 
B)  Molecular composition of DNA is the same in different cells of an organism, whereas RNA and protein contents vary 
C)  A correlation between DNA content and the number of chromosome sets per cell 
D)  DNA is more stable than RNA or protein 
E)  All of these

Exam 9: DNA And The Molecular Structure Of Chromosomes

Which class of proteins is associated with DNA in chromatin?

Which of the following characteristics or functions is not believed to be exhibited by highly repetitive DNA?

Underwound DNA is said to exhibit:

Which of the following is a type of nucleic acid?

Which of the following materials was used by Avery,McLeod,and McCarty in their experimentation to identify the transforming agent?

In Sia and Dawson's 1931 experiment:

The pathogenic effects of viroids are thought to result from:

Infectious agents that contain small circular pieces of RNA that are not packaged in a protein coat are known as:

The technique for visualizing large chromosomes using [³H] thymidine-labeled DNA on protein coated glass slides is called:

Which of the following statements concerning DNA structure is incorrect?

Prokaryotic chromosome structure:

Satellite DNA is

Infectious agents that contain only altered forms of protein and no nucleic acid are known as:

Which of the following is true regarding the structure of DNA?

Which of the following are essential functions that the genetic material must perform?

Hershey and Chase used radiolabeled T2 phages to identify which component of the phage entered E.coli during infection.Which of the following matches the radiolabel with the appropriate phage component?

How does mutation allow an organism to evolve? 1.Changes in the genetic material allow organisms to adapt to modifications in the environment 2)Changes in the genetic material allow organisms to survive in limited types of environment 3)Mutations do not allow an organism to evolve

According to the unineme model of chromosomal structure,how many double stranded DNA molecules run parallel throughout a eukaryotic chromosome?

RNA was first identified as the genetic material of the tobacco mosaic virus (TMV)through an experiment in which:

Before direct proof of DNA being the genetic material,indirect evidence suggesting DNA as the appropriate macromolecule,included

The Science Of Genetics

Cellular Reproduction

Mendelism The Basic Principles Of Inheritance

Extensions Of Mendelism

The Chromosomal Basis Of Mendelism

Variation In Chromosome Number And Structure

Linkage,Crossing Over,And Chromosome Mapping In …

The Genetics Of Bacteria And Their Viruses

Replication Of DNA And Chromosomes

Transcription And RNA Processing

Translation And The Genetic Code

Mutation,DNA Repair,And Recombination

The Techniques Of Molecular Genetics

Genomics

Applications Of Molecular Genetics

Transposable Genetics Elements

Regulation Of Gene Expression In Prokaryotes

Regulation Of Gene Expression In Eukaryotes

The Genetic Control Of Animal Development

The Genetic Basis Of Cancer

Inheritance Of Complex Traits

Population Genetics

Evolutionary Genetics

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