Question 1

Chromatin condenses to form discrete,visible chromosomes

Accepted Answer

A)  early in G1. 
B)  during S. 
C)  during telophase. 
D)  during prophase. 
E)  at the end of cytokinesis. 
A)  early in G1. 
B)  during S. 
C)  during telophase. 
D)  during prophase. 
E)  at the end of cytokinesis.

Question 2

In an organism with a diploid number of 8,a gamete has _______ chromosomes and a liver cell has _______ chromosomes.

Accepted Answer

A)  8;8 
B)  8;4 
C)  2;8 
D)  4;8 
E)  4;4 
A)  8;8 
B)  8;4 
C)  2;8 
D)  4;8 
E)  4;4

Question 3

Cyclin-dependent kinases (CDKs)catalyze the phosphorylation of targeted proteins,a process that

Accepted Answer

A)  decreases the mass of the proteins. 
B)  makes the targeted proteins hydrophobic. 
C)  changes the shape and function of the targeted proteins. 
D)  gives the proteins a three-dimensional shape. 
E)  blocks the cell cycle from proceeding. 
A)  decreases the mass of the proteins. 
B)  makes the targeted proteins hydrophobic. 
C)  changes the shape and function of the targeted proteins. 
D)  gives the proteins a three-dimensional shape. 
E)  blocks the cell cycle from proceeding.

Question 4

During meiosis I in humans,each daughter cell receives

Accepted Answer

A)  only maternal chromosomes. 
B)  a mixture of maternal and paternal chromosomes. 
C)  the same number of chromosomes as that of a diploid cell. 
D)  a sister chromatid from each chromosome. 
E)  one-fourth the amount of DNA that is in the parent nucleus. 
A)  only maternal chromosomes. 
B)  a mixture of maternal and paternal chromosomes. 
C)  the same number of chromosomes as that of a diploid cell. 
D)  a sister chromatid from each chromosome. 
E)  one-fourth the amount of DNA that is in the parent nucleus.

Question 5

The processes of synapsis and the formation of chiasmata does not

Accepted Answer

A)  involve reciprocal exchange of chromosomal sections. 
B)  involve the recombination of DNA on homologous chromosomes. 
C)  bring about an increase in genetic variation. 
D)  provide evidence that an exchange of genetic material has occurred. 
E)  occur for all of the sister chromatids. 
A)  involve reciprocal exchange of chromosomal sections. 
B)  involve the recombination of DNA on homologous chromosomes. 
C)  bring about an increase in genetic variation. 
D)  provide evidence that an exchange of genetic material has occurred. 
E)  occur for all of the sister chromatids.

Question 6

Replication of DNA occurs 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 7

One-fourth of all human breast cancer cells have been found to have an increased amount of the oncogene protein

Accepted Answer

A)  P21. 
B)  HER2. 
C)  CDK. 
D)  cyclin. 
E)  RB. 
A)  P21. 
B)  HER2. 
C)  CDK. 
D)  cyclin. 
E)  RB.

Question 8

Bacteria typically have _______,whereas eukaryotes have _______.

Accepted Answer

A)  one chromosome that is usually circular;several chromosomes that are linear 
B)  several chromosomes that are circular;several chromosomes that are linear 
C)  one chromosome that is linear;several chromosomes that are circular 
D)  two chromosomes that are usually circular;eight chromosomes that are linear 
E)  one chromosome that is linear;several chromosomes that are linear 
A)  one chromosome that is usually circular;several chromosomes that are linear 
B)  several chromosomes that are circular;several chromosomes that are linear 
C)  one chromosome that is linear;several chromosomes that are circular 
D)  two chromosomes that are usually circular;eight chromosomes that are linear 
E)  one chromosome that is linear;several chromosomes that are linear

Question 9

How does mitotic prophase differ from prophase I of meiosis?

Accepted Answer

A)  Chromatin supercoils only in mitotic prophase. 
B)  The nuclear envelope disappears only in prophase I of meiosis. 
C)  Synapsis occurs in mitotic prophase and but not in meiotic prophase I. 
D)  The chromatids separate in mitotic prophase but not in prophase I of meiosis. 
E)  Crossing over is characteristic of prophase I of meiosis but not of mitotic prophase. 
A)  Chromatin supercoils only in mitotic prophase. 
B)  The nuclear envelope disappears only in prophase I of meiosis. 
C)  Synapsis occurs in mitotic prophase and but not in meiotic prophase I. 
D)  The chromatids separate in mitotic prophase but not in prophase I of meiosis. 
E)  Crossing over is characteristic of prophase I of meiosis but not of mitotic prophase.

Question 10

In a haplontic organism's life cycle,the mature organism develops

Accepted Answer

A)  after fertilization and before meiosis. 
B)  after meiosis and before fertilization. 
C)  between meiosis I and II. 
D)  during G1. 
E)  in diploid cells. 
A)  after fertilization and before meiosis. 
B)  after meiosis and before fertilization. 
C)  between meiosis I and II. 
D)  during G1. 
E)  in diploid cells.

Question 11

Which statement about mitosis is true?

Accepted Answer

A)  The chromosome number in the resulting nuclei is halved. 
B)  DNA replication is completed in prophase. 
C)  Crossing over occurs during prophase. 
D)  Two genetically identical daughter nuclei are formed. 
E)  It consists of two nuclear divisions. 
A)  The chromosome number in the resulting nuclei is halved. 
B)  DNA replication is completed in prophase. 
C)  Crossing over occurs during prophase. 
D)  Two genetically identical daughter nuclei are formed. 
E)  It consists of two nuclear divisions.

Question 12

During mitosis and meiosis the chromatin condenses.Which process takes place more easily because of this compaction?

Accepted Answer

A)  The orderly distribution of genetic material to two new nuclei 
B)  The replication of the DNA 
C)  Exposure of the genetic information on the DNA 
D)  The unwinding of DNA from around the proteins 
E)  The disappearance of the nuclear membrane 
A)  The orderly distribution of genetic material to two new nuclei 
B)  The replication of the DNA 
C)  Exposure of the genetic information on the DNA 
D)  The unwinding of DNA from around the proteins 
E)  The disappearance of the nuclear membrane

Question 13

A species of a grass has a haploid number of 14.How many different types of gametes can be produced from meiosis in a diploid individual from independent assortment alone (i.e. ,no crossing over)?

Accepted Answer

A)  27 
B)  214 
C)  228 
D)  142 
E)  282 
A)  27 
B)  214 
C)  228 
D)  142 
E)  282

Question 14

A potato has a diploid number of 48.If an egg of this plant is found to have 23 chromosomes,the most likely explanation is that

Accepted Answer

A)  normal meiosis has occurred. 
B)  nondisjunction occurred during meiosis I. 
C)  normal mitosis has occurred. 
D)  nondisjunction occurred during mitosis. 
E)  crossing over occurred during meiosis I. 
A)  normal meiosis has occurred. 
B)  nondisjunction occurred during meiosis I. 
C)  normal mitosis has occurred. 
D)  nondisjunction occurred during mitosis. 
E)  crossing over occurred during meiosis I.

Question 15

In plant cells,cytokinesis is accomplished by the formation of a(n)

Accepted Answer

A)  aster. 
B)  membrane furrow. 
C)  equatorial plate. 
D)  cell plate. 
E)  spindle. 
A)  aster. 
B)  membrane furrow. 
C)  equatorial plate. 
D)  cell plate. 
E)  spindle.

Question 16

A diploid human cell normally has 23 pairs of homologous chromosomes,but as a woman ages,the chances of nondisjunction increase.Imagine that a gamete is produced that received two homologues of chromosome 21 that had failed to separate during telophase II.If the gamete is fertilized with a normal sperm,the embryo's cells will contain _______ chromosomes.

Accepted Answer

A)  23 
B)  24 
C)  46 
D)  45 
E)  47 
A)  23 
B)  24 
C)  46 
D)  45 
E)  47

Question 17

The mitotic spindle is composed of

Accepted Answer

A)  chromosomes. 
B)  chromatids. 
C)  microtubules. 
D)  chromatin. 
E)  centrosomes. 
A)  chromosomes. 
B)  chromatids. 
C)  microtubules. 
D)  chromatin. 
E)  centrosomes.

Question 18

Condensation of chromosomes occurs during

Accepted Answer

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

Question 19

Which outcome would most likely result from a mutation in the ori gene of a bacterial cell?

Accepted Answer

A)  The cell is unable to detect whether conditions were favorable for replication. 
B)  The initiation of DNA replication is hindered. 
C)  DNA replication is prolonged abnormally. 
D)  The cell is unable to segregate DNA molecules. 
E)  The cell cannot undergo meiosis. 
A)  The cell is unable to detect whether conditions were favorable for replication. 
B)  The initiation of DNA replication is hindered. 
C)  DNA replication is prolonged abnormally. 
D)  The cell is unable to segregate DNA molecules. 
E)  The cell cannot undergo meiosis.

Question 20

DNA replication occurs

Accepted Answer

A)  during both mitosis and meiosis. 
B)  only during mitosis. 
C)  only during meiosis. 
D)  during S phase. 
E)  during G2 phase. 
A)  during both mitosis and meiosis. 
B)  only during mitosis. 
C)  only during meiosis. 
D)  during S phase. 
E)  during G2 phase.

Exam 7: The Cell Cycle and Cell Division

Chromatin condenses to form discrete,visible chromosomes

In an organism with a diploid number of 8,a gamete has _______ chromosomes and a liver cell has _______ chromosomes.

Cyclin-dependent kinases (CDKs)catalyze the phosphorylation of targeted proteins,a process that

During meiosis I in humans,each daughter cell receives

The processes of synapsis and the formation of chiasmata does not

Replication of DNA occurs during

One-fourth of all human breast cancer cells have been found to have an increased amount of the oncogene protein

Bacteria typically have _______,whereas eukaryotes have _______.

How does mitotic prophase differ from prophase I of meiosis?

In a haplontic organism's life cycle,the mature organism develops

Which statement about mitosis is true?

During mitosis and meiosis the chromatin condenses.Which process takes place more easily because of this compaction?

A species of a grass has a haploid number of 14.How many different types of gametes can be produced from meiosis in a diploid individual from independent assortment alone (i.e. ,no crossing over)?

A potato has a diploid number of 48.If an egg of this plant is found to have 23 chromosomes,the most likely explanation is that

In plant cells,cytokinesis is accomplished by the formation of a(n)

The mitotic spindle is composed of

Condensation of chromosomes occurs during

Which outcome would most likely result from a mutation in the ori gene of a bacterial cell?

DNA replication occurs

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

In an organism with a diploid number of 8,a gamete has _ chromosomes and a liver cell has _ chromosomes.

Bacteria typically have _,whereas eukaryotes have _.