Question 1

Mismatch errors are

Accepted Answer

A)  almost always corrected by mutagens. 
B)  almost always corrected by DNA repair proteins. 
C)  usually caused by transposons. 
D)  usually caused by mutated proteins. 
A)  almost always corrected by mutagens. 
B)  almost always corrected by DNA repair proteins. 
C)  usually caused by transposons. 
D)  usually caused by mutated proteins.

Question 2

To start DNA replication,the bonds holding the strands together are broken,and the molecule begins to unwind.Which of the following statements best summarizes what happens next?

Accepted Answer

A)  New strands are synthesized and paired with each other. 
B)  Each old strand acts as a template for a new strand. 
C)  Each old strand is broken down into nucleotides. 
D)  Transformation results in a new DNA molecule. 
A)  New strands are synthesized and paired with each other. 
B)  Each old strand acts as a template for a new strand. 
C)  Each old strand is broken down into nucleotides. 
D)  Transformation results in a new DNA molecule.

Question 3

A gene sequence is disrupted by a mobile segment of DNA such that the gene is no longer functional.The mobile segment of DNA is a ________.

Accepted Answer

The answer of A gene sequence is disrupted by a...

Question 4

DNA is ________ [more or less] tightly packaged during interphase when most gene expression occurs.

Accepted Answer

The answer of DNA is ________ [more or less] tightly...

Question 5

A segment of DNA is present in a gene,is transcribed,but is not used in translation.This segment of DNA is a(an)

Accepted Answer

A)  intron. 
B)  transposon. 
C)  spacer DNA. 
D)  exon. 
A)  intron. 
B)  transposon. 
C)  spacer DNA. 
D)  exon.

Question 6

Once a gene is turned on,it cannot be turned off.

Accepted Answer

A) True 
 B)False

Question 7

Where in this diagram of the flow of genetic information of the cell would translation occur?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

Question 8

Housekeeping genes

Accepted Answer

A)  prevent repressors from binding the promoter. 
B)  prevent operators from expressing genes. 
C)  are expressed by most of the cells in an organism. 
D)  break down a cell's DNA. 
A)  prevent repressors from binding the promoter. 
B)  prevent operators from expressing genes. 
C)  are expressed by most of the cells in an organism. 
D)  break down a cell's DNA.

Question 9

Along one side of a DNA molecule,the nucleotides are connected to each other by

Accepted Answer

A)  covalent bonds between phosphate groups and sugar molecules. 
B)  hydrogen bonds between adenine and guanine. 
C)  covalent bonds between bases and sugar molecules. 
D)  hydrogen bonds between adjacent sugar molecules. 
A)  covalent bonds between phosphate groups and sugar molecules. 
B)  hydrogen bonds between adenine and guanine. 
C)  covalent bonds between bases and sugar molecules. 
D)  hydrogen bonds between adjacent sugar molecules.

Question 10

Once replication in a DNA molecule is complete,each new DNA molecule contains one old strand and one new strand.This type of replication is called

Accepted Answer

A)  transcriptive. 
B)  semiconservative. 
C)  covalent. 
D)  corruptive. 
A)  transcriptive. 
B)  semiconservative. 
C)  covalent. 
D)  corruptive.

Question 11

Protein is the hereditary genetic material in human cells.

Accepted Answer

A) True 
 B)False

Question 12

Scientists discovered that Otzi,the 5,200-year-old frozen Copper Age man found in the Alps in 1991,had a variable DNA sequence called K.What caused the variations in this DNA sequence?

Accepted Answer

A)  mutations 
B)  diet 
C)  injuries he sustained 
D)  his frozen condition 
A)  mutations 
B)  diet 
C)  injuries he sustained 
D)  his frozen condition

Question 13

Bacterial cultures are sometimes exposed to ultraviolet (UV)light in order to generate organisms with new genetic traits.Why do microbiologists choose to use UV light for this purpose?

Accepted Answer

A)  UV light makes all cells antibiotic resistant. 
B)  UV light has the ability to cause changes in DNA. 
C)  UV light is the usual source of energy for bacteria, thus giving them more energy for evolution. 
D)  UV light promotes photosynthesis in bacteria. 
A)  UV light makes all cells antibiotic resistant. 
B)  UV light has the ability to cause changes in DNA. 
C)  UV light is the usual source of energy for bacteria, thus giving them more energy for evolution. 
D)  UV light promotes photosynthesis in bacteria.

Question 14

What part of a nucleotide accounts for the genetic variation between individuals?

Accepted Answer

A)  sugar 
B)  phosphate 
C)  base 
D)  polymerase 
A)  sugar 
B)  phosphate 
C)  base 
D)  polymerase

Question 15

The adenine bases in a DNA molecule are radioactively labeled.The DNA is then placed in a solution containing unlabeled nucleotides and the enzymes needed for DNA replication.The DNA molecule is allowed to replicate twice,forming four new DNA molecules.You would find the radioactively labeled adenine in

Accepted Answer

A)  each of the eight strands. 
B)  two of the eight strands. 
C)  all but one strand. 
D)  six of the eight strands. 
A)  each of the eight strands. 
B)  two of the eight strands. 
C)  all but one strand. 
D)  six of the eight strands.

Question 16

What is NOT true of the five different cell types from the individual shown in the following figure?

Accepted Answer

A)  They have the same DNA sequence. 
B)  They contain the same genes. 
C)  They express the same genes at the same time. 
D)  They have the same housekeeping genes. 
A)  They have the same DNA sequence. 
B)  They contain the same genes. 
C)  They express the same genes at the same time. 
D)  They have the same housekeeping genes.

Question 17

A rapidly dividing cell is exposed to a chemical that converts the bond that forms between adenine and thymine to a covalent bond.Which of the following is most likely to occur?

Accepted Answer

A)  DNA replication would produce two molecules of DNA with mutations at every base that once held an A-T base pair. 
B)  DNA replication would not occur because the two nucleotide strands that make up the DNA molecule would not be able to separate. 
C)  DNA replication would occur more slowly because DNA repair proteins would have to fix the covalent bonds before replication could begin. 
D)  DNA replication would be faster because covalent bonds require less energy to break than hydrogen bonds. 
A)  DNA replication would produce two molecules of DNA with mutations at every base that once held an A-T base pair. 
B)  DNA replication would not occur because the two nucleotide strands that make up the DNA molecule would not be able to separate. 
C)  DNA replication would occur more slowly because DNA repair proteins would have to fix the covalent bonds before replication could begin. 
D)  DNA replication would be faster because covalent bonds require less energy to break than hydrogen bonds.

Question 18

Which of the following is NOT true? Organisms turn genes on and off

Accepted Answer

A)  depending on the function of the cell. 
B)  in response to environmental changes. 
C)  to cause certain developmental changes. 
D)  to switch from prokaryotic to eukaryotic status. 
A)  depending on the function of the cell. 
B)  in response to environmental changes. 
C)  to cause certain developmental changes. 
D)  to switch from prokaryotic to eukaryotic status.

Question 19

Benzopyrene is a compound found in cigarettes that binds to the base guanine in DNA.This distorts the DNA double helix and causes changes in DNA sequence.Based on this information,benzopyrene is a

Accepted Answer

A)  DNA repair protein. 
B)  histone. 
C)  transposon. 
D)  mutagen. 
A)  DNA repair protein. 
B)  histone. 
C)  transposon. 
D)  mutagen.

Question 20

The "rungs" in the DNA "ladder" consist of ________ pairs.

Accepted Answer

The answer of The "rungs" in the DNA "ladder" consist...

Exam 11: DNA and Genes

Mismatch errors are

To start DNA replication,the bonds holding the strands together are broken,and the molecule begins to unwind.Which of the following statements best summarizes what happens next?

A gene sequence is disrupted by a mobile segment of DNA such that the gene is no longer functional.The mobile segment of DNA is a ________.

DNA is ________ [more or less] tightly packaged during interphase when most gene expression occurs.

A segment of DNA is present in a gene,is transcribed,but is not used in translation.This segment of DNA is a(an)

Once a gene is turned on,it cannot be turned off.

Where in this diagram of the flow of genetic information of the cell would translation occur?

Housekeeping genes

Along one side of a DNA molecule,the nucleotides are connected to each other by

Once replication in a DNA molecule is complete,each new DNA molecule contains one old strand and one new strand.This type of replication is called

Protein is the hereditary genetic material in human cells.

Scientists discovered that Otzi,the 5,200-year-old frozen Copper Age man found in the Alps in 1991,had a variable DNA sequence called K.What caused the variations in this DNA sequence?

Bacterial cultures are sometimes exposed to ultraviolet (UV)light in order to generate organisms with new genetic traits.Why do microbiologists choose to use UV light for this purpose?

What part of a nucleotide accounts for the genetic variation between individuals?

What is NOT true of the five different cell types from the individual shown in the following figure?

A rapidly dividing cell is exposed to a chemical that converts the bond that forms between adenine and thymine to a covalent bond.Which of the following is most likely to occur?

Which of the following is NOT true? Organisms turn genes on and off

Benzopyrene is a compound found in cigarettes that binds to the base guanine in DNA.This distorts the DNA double helix and causes changes in DNA sequence.Based on this information,benzopyrene is a

The "rungs" in the DNA "ladder" consist of ________ pairs.

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photo Synthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

Ecological Communities

Ecosystems

Global Change

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