Question 1

A zygote contains 16 chromosomes.The diploid number of this cell is ________ [2n = ?].

Accepted Answer

The answer of A zygote contains 16 chromosomes.The diploid number...

Question 2

Which set of symbols represents the stages of interphase?

Accepted Answer

A)  G0,G1,and G2 
B)  S1,S2,and G0 
C)  G0,G1,and S 
D)  G1,S,and G2 
A)  G0,G1,and G2 
B)  S1,S2,and G0 
C)  G0,G1,and S 
D)  G1,S,and G2

Question 3

Cell division,which is the climax of the cell cycle,consists of

Accepted Answer

A)  chromosome replication and separation. 
B)  the breakup of the nucleus at the metaphase plate. 
C)  cytokinesis plus mitosis or meiosis. 
D)  the formation of a new karyotype. 
A)  chromosome replication and separation. 
B)  the breakup of the nucleus at the metaphase plate. 
C)  cytokinesis plus mitosis or meiosis. 
D)  the formation of a new karyotype.

Question 4

In animals,only meiosis can lead to the production of new ________.

Accepted Answer

A)  skin 
B)  brain 
C)  sperm 
D)  liver 
A)  skin 
B)  brain 
C)  sperm 
D)  liver

Question 5

Sexual reproduction results in many benefits for a population,but also some inconveniences.Which of the following statements is NOT an example of an inconvenience of sexual reproduction?

Accepted Answer

A)  Each participant in sexual reproduction must locate an appropriate mate. 
B)  The time required for sexual reproduction may mean that short-term opportunities for population growth via asexual reproduction will be missed. 
C)  Some genetic combinations may be disadvantageous and/or lethal for offspring,and the effort invested in producing offspring would therefore be wasted. 
D)  Sexual reproduction with each reproductive event is more likely to result in too many offspring for the species. 
A)  Each participant in sexual reproduction must locate an appropriate mate. 
B)  The time required for sexual reproduction may mean that short-term opportunities for population growth via asexual reproduction will be missed. 
C)  Some genetic combinations may be disadvantageous and/or lethal for offspring,and the effort invested in producing offspring would therefore be wasted. 
D)  Sexual reproduction with each reproductive event is more likely to result in too many offspring for the species.

Question 6

Which of the following statements is a correct reason why the process of cell division in prokaryotes is different from cell division in eukaryotes?

Accepted Answer

A)  Prokaryotes have a circular DNA molecule;eukaryotes have linear DNA molecules in their nuclei. 
B)  Prokaryotic cells do not undergo cell division,and eukaryotic cells do. 
C)  Prokaryotic cells are larger than eukaryotic cells. 
D)  Prokaryotic DNA contains bases that are different from those in eukaryotic DNA. 
A)  Prokaryotes have a circular DNA molecule;eukaryotes have linear DNA molecules in their nuclei. 
B)  Prokaryotic cells do not undergo cell division,and eukaryotic cells do. 
C)  Prokaryotic cells are larger than eukaryotic cells. 
D)  Prokaryotic DNA contains bases that are different from those in eukaryotic DNA.

Question 7

The mitotic spindle is made of

Accepted Answer

A)  centrosomes. 
B)  chromosomes. 
C)  kinetochores. 
D)  microtubules. 
A)  centrosomes. 
B)  chromosomes. 
C)  kinetochores. 
D)  microtubules.

Question 8

The completion of the physical division of the parent cell cytoplasm that usually occurs during the last stage of mitosis is known as

Accepted Answer

A)  centrosome formation. 
B)  G0. 
C)  cytokinesis. 
D)  meiosis. 
A)  centrosome formation. 
B)  G0. 
C)  cytokinesis. 
D)  meiosis.

Question 9

Why must DNA be packed into chromosomes before mitosis or meiosis can occur?

Accepted Answer

A)  In their unpacked state,the DNA strands would be difficult to pull apart during cell division. 
B)  The zygote would be unable to live if the DNA was not packed into chromosomes. 
C)  We would be unable to see the karyotype if the DNA was not packed into chromosomes. 
D)  Some of the genes would escape during cell division if they were not tightly packed into chromosomes. 
A)  In their unpacked state,the DNA strands would be difficult to pull apart during cell division. 
B)  The zygote would be unable to live if the DNA was not packed into chromosomes. 
C)  We would be unable to see the karyotype if the DNA was not packed into chromosomes. 
D)  Some of the genes would escape during cell division if they were not tightly packed into chromosomes.

Question 10

During the S phase,the cell

Accepted Answer

A)  duplicates its DNA. 
B)  increases in size to prepare for DNA synthesis. 
C)  completes its preparation for mitosis. 
D)  rests between divisions. 
A)  duplicates its DNA. 
B)  increases in size to prepare for DNA synthesis. 
C)  completes its preparation for mitosis. 
D)  rests between divisions.

Question 11

Lily plants sometimes have twice as many chromosomes per cell as their parent plants.Which of the following statements explains how this phenomenon might have happened?

Accepted Answer

A)  The lily's sister chromatids failed to separate during meiosis. 
B)  The lily's chromosome number went from 2n to 1n. 
C)  The lily's gametes fused during mitosis. 
D)  The parent plant lost half of its chromosomes during mitosis. 
A)  The lily's sister chromatids failed to separate during meiosis. 
B)  The lily's chromosome number went from 2n to 1n. 
C)  The lily's gametes fused during mitosis. 
D)  The parent plant lost half of its chromosomes during mitosis.

Question 12

Which of the following statements about the microtubules that grow out from the centrosomes is true?

Accepted Answer

A)  They pull the nuclear envelope apart. 
B)  They pull the centrosomes together. 
C)  They eventually become kinetochores. 
D)  They eventually attach to centromeres. 
A)  They pull the nuclear envelope apart. 
B)  They pull the centrosomes together. 
C)  They eventually become kinetochores. 
D)  They eventually attach to centromeres.

Question 13

Some human cells (skeletal muscle,for example)are multinucleated and originate when uninucleated cells fuse.What cell division process alone could produce a multinucleated cell?

Accepted Answer

A)  a cell undergoing mitosis but not cytokinesis 
B)  a cell undergoing cytokinesis but not mitosis 
C)  a cell arresting after meiosis I 
D)  fertilization of a haploid egg by a diploid sperm 
A)  a cell undergoing mitosis but not cytokinesis 
B)  a cell undergoing cytokinesis but not mitosis 
C)  a cell arresting after meiosis I 
D)  fertilization of a haploid egg by a diploid sperm

Question 14

Cancers are groups of cells that divide uncontrollably because they

Accepted Answer

A)  are always in the G0 phase. 
B)  never enter the cell cycle. 
C)  are unable to respond to the negative internal or external signals that keep the cell from dividing. 
D)  are stuck at the metaphase plate. 
A)  are always in the G0 phase. 
B)  never enter the cell cycle. 
C)  are unable to respond to the negative internal or external signals that keep the cell from dividing. 
D)  are stuck at the metaphase plate.

Question 15

Oocytes are such big cells that a person with good eyesight could see them without a microscope.

Accepted Answer

A) True 
 B)False

Question 16

Biologists believe the process of mitosis evolved from binary fission.What are the similarities between these two processes?

Accepted Answer

A)  In both processes,the DNA that is being separated is attached to a membrane. 
B)  Both processes necessarily involve the separation of more than one piece of DNA. 
C)  Both processes include DNA segregation. 
D)  DNA must be tightly packaged into chromosomes before either process can begin. 
A)  In both processes,the DNA that is being separated is attached to a membrane. 
B)  Both processes necessarily involve the separation of more than one piece of DNA. 
C)  Both processes include DNA segregation. 
D)  DNA must be tightly packaged into chromosomes before either process can begin.

Question 17

In human females,when is meiosis II finished?

Accepted Answer

A)  just before birth 
B)  just after birth 
C)  at ovulation 
D)  after fertilization by a sperm cell 
A)  just before birth 
B)  just after birth 
C)  at ovulation 
D)  after fertilization by a sperm cell

Question 18

A single cell grows into a multicellular organism by the process of

Accepted Answer

A)  mitosis. 
B)  meiosis. 
C)  fertilization. 
D)  duplication. 
A)  mitosis. 
B)  meiosis. 
C)  fertilization. 
D)  duplication.

Question 19

The mitotic spindle guides the movement of chromosomes during certain stages of mitosis.

Accepted Answer

A) True 
 B)False

Question 20

The goal of mitosis is to

Accepted Answer

A)  form two equal daughter nuclei. 
B)  form chromatin strands. 
C)  loop chromatin into chromosomes. 
D)  package chromosomes into chromatin. 
A)  form two equal daughter nuclei. 
B)  form chromatin strands. 
C)  loop chromatin into chromosomes. 
D)  package chromosomes into chromatin.

Exam 7: Cell Division

A zygote contains 16 chromosomes.The diploid number of this cell is ________ [2n = ?].

Which set of symbols represents the stages of interphase?

Cell division,which is the climax of the cell cycle,consists of

In animals,only meiosis can lead to the production of new ________.

Sexual reproduction results in many benefits for a population,but also some inconveniences.Which of the following statements is NOT an example of an inconvenience of sexual reproduction?

Which of the following statements is a correct reason why the process of cell division in prokaryotes is different from cell division in eukaryotes?

The mitotic spindle is made of

The completion of the physical division of the parent cell cytoplasm that usually occurs during the last stage of mitosis is known as

Why must DNA be packed into chromosomes before mitosis or meiosis can occur?

During the S phase,the cell

Lily plants sometimes have twice as many chromosomes per cell as their parent plants.Which of the following statements explains how this phenomenon might have happened?

Which of the following statements about the microtubules that grow out from the centrosomes is true?

Some human cells (skeletal muscle,for example)are multinucleated and originate when uninucleated cells fuse.What cell division process alone could produce a multinucleated cell?

Cancers are groups of cells that divide uncontrollably because they

Oocytes are such big cells that a person with good eyesight could see them without a microscope.

Biologists believe the process of mitosis evolved from binary fission.What are the similarities between these two processes?

In human females,when is meiosis II finished?

A single cell grows into a multicellular organism by the process of

The mitotic spindle guides the movement of chromosomes during certain stages of mitosis.

The goal of mitosis is to

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

Photosynthesis and Cellular Respiration

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

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

Internal Organization and Homeostasis

Nutrition and Digestion

Circulation and Gas Exchange

Animal Hormones

Nervous and Sensory Systems

Skeletons,Muscles,and Movement

The Immune System

Reproduction and Development

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

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