Question 1

Genetic recombination occurs during

Accepted Answer

A)  prophase of meiosis I. 
B)  the interphase preceding meiosis II. 
C)  the mitotic telophase. 
D)  fertilization. 
E)  the formation of somatic cells. 
A)  prophase of meiosis I. 
B)  the interphase preceding meiosis II. 
C)  the mitotic telophase. 
D)  fertilization. 
E)  the formation of somatic cells.

Question 2

Down syndrome can be diagnosed by means of an examination of the individual's

Accepted Answer

A)  spores. 
B)  karyotype. 
C)  chromatin. 
D)  nucleosomes. 
E)  kinetochores. 
A)  spores. 
B)  karyotype. 
C)  chromatin. 
D)  nucleosomes. 
E)  kinetochores.

Question 3

Microtubules that form the mitotic spindle tend to originate from or terminate in

Accepted Answer

A)  centromeres and telomeres. 
B)  euchromatin. 
C)  centrioles and telomeres. 
D)  the nuclear envelope. 
E)  centrioles and kinetochores. 
A)  centromeres and telomeres. 
B)  euchromatin. 
C)  centrioles and telomeres. 
D)  the nuclear envelope. 
E)  centrioles and kinetochores.

Question 4

In a particular diploid organism,somatic cells have 24 chromosomes.How many chromosomes would be present in the gametes of that organism?

Accepted Answer

A)  1 
B)  6 
C)  12 
D)  24 
E)  48 
A)  1 
B)  6 
C)  12 
D)  24 
E)  48

Question 5

The structures that line up the chromatids on the equatorial plate during metaphase are called

Accepted Answer

A)  asters. 
B)  polar and kinetochore microtubules. 
C)  centrosomes. 
D)  centrioles. 
E)  poles. 
A)  asters. 
B)  polar and kinetochore microtubules. 
C)  centrosomes. 
D)  centrioles. 
E)  poles.

Question 6

When dividing cells are examined under a light microscope,chromosomes first become visible during

Accepted Answer

A)  interphase. 
B)  the S phase. 
C)  prophase. 
D)  G1 phase. 
E)  G2 phase. 
A)  interphase. 
B)  the S phase. 
C)  prophase. 
D)  G1 phase. 
E)  G2 phase.

Question 7

The four haploid nuclei found at the end of meiosis differ from one another in their exact genetic composition.Some of this difference is the result of

Accepted Answer

A)  cytokinesis. 
B)  replication of DNA during S phase. 
C)  separation of sister chromatids at anaphase II. 
D)  spindle formation. 
E)  crossing over during prophase I. 
A)  cytokinesis. 
B)  replication of DNA during S phase. 
C)  separation of sister chromatids at anaphase II. 
D)  spindle formation. 
E)  crossing over during prophase I.

Question 8

Caspases play a role in the process of

Accepted Answer

A)  autopolyploidy. 
B)  allopolyploidy. 
C)  aneuploidy. 
D)  necrosis. 
E)  apoptosis. 
A)  autopolyploidy. 
B)  allopolyploidy. 
C)  aneuploidy. 
D)  necrosis. 
E)  apoptosis.

Question 9

The energy to move chromosomes during mitosis is provided by

Accepted Answer

A)  centrioles. 
B)  DNA polymerization. 
C)  migration of the centrosomes. 
D)  formation of the cell plate. 
E)  ATP. 
A)  centrioles. 
B)  DNA polymerization. 
C)  migration of the centrosomes. 
D)  formation of the cell plate. 
E)  ATP.

Question 10

Mature nerve cells,which are incapable of cell division,are most likely in

Accepted Answer

A)  G1 phase. 
B)  S phase. 
C)  G2 phase. 
D)  mitosis. 
E)  meiosis. 
A)  G1 phase. 
B)  S phase. 
C)  G2 phase. 
D)  mitosis. 
E)  meiosis.

Question 11

In a female animal with a diploid chromosome number of 12,half of the egg cells are found to have five chromosomes.The most probable explanation is

Accepted Answer

A)  normal mitosis. 
B)  normal meiosis. 
C)  nondisjunction in meiosis I. 
D)  nondisjunction in meiosis II. 
E)  nondisjunction in mitosis. 
A)  normal mitosis. 
B)  normal meiosis. 
C)  nondisjunction in meiosis I. 
D)  nondisjunction in meiosis II. 
E)  nondisjunction in mitosis.

Question 12

Which does not represent a correct pairing of phase and event?

Accepted Answer

A)  Prophase: duplication of centrosome 
B)  Metaphase: formation of equatorial plate 
C)  Telophase: formation of nuclear envelopes 
D)  Interphase: replication of DNA 
E)  Anaphase: separation of chromatids 
A)  Prophase: duplication of centrosome 
B)  Metaphase: formation of equatorial plate 
C)  Telophase: formation of nuclear envelopes 
D)  Interphase: replication of DNA 
E)  Anaphase: separation of chromatids

Question 13

A typical eukaryotic cell cycle consists of

Accepted Answer

A)  mitosis and meiosis. 
B)  G1,the S phase,and G2. 
C)  prophase,metaphase,anaphase,and telophase. 
D)  interphase,mitosis,and cytokinesis. 
E)  mitosis and fertilization. 
A)  mitosis and meiosis. 
B)  G1,the S phase,and G2. 
C)  prophase,metaphase,anaphase,and telophase. 
D)  interphase,mitosis,and cytokinesis. 
E)  mitosis and fertilization.

Question 14

Some organisms can reproduce by "cloning" themselves,an asexual process.Which type of organism is least able to naturally reproduce through "cloning"?

Accepted Answer

A)  Trees 
B)  Bacteria 
C)  Mammals 
D)  Fungi 
E)  Yeast 
A)  Trees 
B)  Bacteria 
C)  Mammals 
D)  Fungi 
E)  Yeast

Question 15

_______ is an indicator of programmed cell death.

Accepted Answer

A)  Fragmented chromatin 
B)  Swelling of the membrane 
C)  Cell lysis 
D)  Loss of transcription control 
E)  The release of cell contents 
A)  Fragmented chromatin 
B)  Swelling of the membrane 
C)  Cell lysis 
D)  Loss of transcription control 
E)  The release of cell contents

Question 16

A cell synthesizes the components required for mitosis during

Accepted Answer

A)  G1 phase. 
B)  S phase. 
C)  G2 phase. 
D)  M phase. 
E)  prophase. 
A)  G1 phase. 
B)  S phase. 
C)  G2 phase. 
D)  M phase. 
E)  prophase.

Question 17

Regulation of the cell cycle is dependent on cyclins and cyclin-dependent kinases (CDKs).The key factor that allows a cell to progress beyond the restriction point in G1 is

Accepted Answer

A)  the presence of cyclin. 
B)  the absence of cyclin. 
C)  the presence of cyclin and CDK. 
D)  phosphorylation of RB by CDK. 
E)  the presence of external signals from growth factors. 
A)  the presence of cyclin. 
B)  the absence of cyclin. 
C)  the presence of cyclin and CDK. 
D)  phosphorylation of RB by CDK. 
E)  the presence of external signals from growth factors.

Question 18

The exchange of genetic material between chromatids on homologous chromosomes occurs during

Accepted Answer

A)  interphase. 
B)  mitosis and meiosis. 
C)  prophase I. 
D)  anaphase I. 
E)  anaphase II. 
A)  interphase. 
B)  mitosis and meiosis. 
C)  prophase I. 
D)  anaphase I. 
E)  anaphase II.

Question 19

In all sexually reproducing organisms,the diploid phase of the life cycle begins at

Accepted Answer

A)  spore formation. 
B)  gamete formation. 
C)  meiosis. 
D)  mitosis. 
E)  fertilization. 
A)  spore formation. 
B)  gamete formation. 
C)  meiosis. 
D)  mitosis. 
E)  fertilization.

Question 20

Which statement regarding tumor suppressor drugs and drugs developed to treat cancers resulting from oncogenes is true?

Accepted Answer

A)  Both tumor suppressors and oncogenes need to be switched on. 
B)  Tumor suppressors need to be switched off,whereas oncogenes need to be switched on. 
C)  Both tumor suppressors and oncogenes need to be switched off. 
D)  Tumor suppressors need to be reactivated,whereas oncogenes need to be switched off. 
E)  The retinoblastoma (R
B) gene is an oncogene. 
A)  Both tumor suppressors and oncogenes need to be switched on. 
B)  Tumor suppressors need to be switched off,whereas oncogenes need to be switched on. 
C)  Both tumor suppressors and oncogenes need to be switched off. 
D)  Tumor suppressors need to be reactivated,whereas oncogenes need to be switched off. 
E)  The retinoblastoma (R
B) gene is an oncogene.

Exam 7: The Cell Cycle and Cell Division

Genetic recombination occurs during

Down syndrome can be diagnosed by means of an examination of the individual's

Microtubules that form the mitotic spindle tend to originate from or terminate in

In a particular diploid organism,somatic cells have 24 chromosomes.How many chromosomes would be present in the gametes of that organism?

The structures that line up the chromatids on the equatorial plate during metaphase are called

When dividing cells are examined under a light microscope,chromosomes first become visible during

The four haploid nuclei found at the end of meiosis differ from one another in their exact genetic composition.Some of this difference is the result of

Caspases play a role in the process of

The energy to move chromosomes during mitosis is provided by

Mature nerve cells,which are incapable of cell division,are most likely in

In a female animal with a diploid chromosome number of 12,half of the egg cells are found to have five chromosomes.The most probable explanation is

Which does not represent a correct pairing of phase and event?

A typical eukaryotic cell cycle consists of

Some organisms can reproduce by "cloning" themselves,an asexual process.Which type of organism is least able to naturally reproduce through "cloning"?

_______ is an indicator of programmed cell death.

A cell synthesizes the components required for mitosis during

Regulation of the cell cycle is dependent on cyclins and cyclin-dependent kinases (CDKs).The key factor that allows a cell to progress beyond the restriction point in G1 is

The exchange of genetic material between chromatids on homologous chromosomes occurs during

In all sexually reproducing organisms,the diploid phase of the life cycle begins at

Which statement regarding tumor suppressor drugs and drugs developed to treat cancers resulting from oncogenes is true?

Introduction

The Chemistry and Energy of Life

Nucleic Acids, Proteins, and Enzymes

Cells: the Working Units of Life

Cell Membranes and Signaling

Pathways That Harvest and Store Chemical Energy

Inheritance, Genes, and Chromosomes

DNA and Its Role in Heredity

From Dna to Protein: Gene Expression

Regulation of Gene Expression

Genomes

Biotechnology

Genes, Development, and Evolution

Processes of Evolution

Reconstructing and Using Phylogenies

Speciation

The History of Life on Earth

Bacteria, Archaea, and Viruses

The Origin and Diversification of Eukaryotes

The Evolution of Plants

The Evolution and Diversity of Fungi

Animal Origins and Diversity

The Plant Body

Plant Nutrition and Transport

Plant Growth and Development

Reproduction of Flowering Plants

Plants in the Environment

Fundamentals of Animal Function

Nutrition and Digestion

Breathing

Circulation

Muscle and Movement

Neurons, Sense Organs, and Nervous Systems

Nervous and Endocrine Control

Water and Salts: Excretion

Animal Reproduction

Animal Development

Immunology: Animal Defense Systems

Animal Behavior

The Distribution of Earths Ecological Systems

Populations

Ecological and Evolutionary Consequences of Interactions Within and Among Species

Ecological Communities

The Global Ecosystem

Filters