Question 1

Why don't plant cells form a cleavage furrow during cytokinesis?

Accepted Answer

A)  because their cells don't divide after mitosis, but become one larger cell with multiple nuclei 
B)  because they don't have a cell membrane 
C)  because they have a cell wall 
D)  because they don't have a nucleus 
E)  All of the answer choices are correct. 
A)  because their cells don't divide after mitosis, but become one larger cell with multiple nuclei 
B)  because they don't have a cell membrane 
C)  because they have a cell wall 
D)  because they don't have a nucleus 
E)  All of the answer choices are correct. C

Question 2

Cyclophosphamide forms cross links between the two strands of DNA in a chromosome.How would this be effective in chemotherapy?

Accepted Answer

A)  It would block splicing. 
B)  It would activate oncogenes. 
C)  It would block metaphase. 
D)  It would inactivate tumor suppressors. 
E)  It would block DNA replication. 
A)  It would block splicing. 
B)  It would activate oncogenes. 
C)  It would block metaphase. 
D)  It would inactivate tumor suppressors. 
E)  It would block DNA replication. E

Question 3

Replication takes place during the G1 phase of interphase.

Accepted Answer

A) True 
 B)False  False

Question 4

How does the space between our fingers arise?

Accepted Answer

A)  The cells die by necrosis. 
B)  Mitosis of the cells is blocked. 
C)  The cells die by apoptosis. 
D)  The cells become part of the fingers. 
E)  Meiosis of the cells is blocked. 
A)  The cells die by necrosis. 
B)  Mitosis of the cells is blocked. 
C)  The cells die by apoptosis. 
D)  The cells become part of the fingers. 
E)  Meiosis of the cells is blocked.

Question 5

Complementary DNA strands are held together by

Accepted Answer

A)  ionic bonds. 
B)  hydrogen bonds. 
C)  covalent bonds. 
D)  phosphodiester bonds. 
A)  ionic bonds. 
B)  hydrogen bonds. 
C)  covalent bonds. 
D)  phosphodiester bonds.

Question 6

The enzyme that adds nucleotides along the 5' to 3' along a DNA strand,is

Accepted Answer

A)  primase. 
B)  DNA polymerase. 
C)  helicase. 
D)  ligase. 
E)  ATP synthase. 
A)  primase. 
B)  DNA polymerase. 
C)  helicase. 
D)  ligase. 
E)  ATP synthase.

Question 7

Figuer:
This diagram shows how DNA is packaged and folded with its associated protective and regulatory proteins.  
-A part of a chromosome,that attaches sister chromatids to each other,defines the term

Accepted Answer

A)  nucleosome. 
B)  None of the answer choices are correct. 
C)  chromatin. 
D)  histone. 
E)  centromere. 
A)  nucleosome. 
B)  None of the answer choices are correct. 
C)  chromatin. 
D)  histone. 
E)  centromere.

Question 8

If scientists could increase telomerase production in specific cells,the primary reason for this would most likely be the stopping of

Accepted Answer

A)  aging of cells. 
B)  cancer cell formation. 
C)  aerobic respiration. 
D)  meiosis. 
E)  All of the answer choices are correct. 
A)  aging of cells. 
B)  cancer cell formation. 
C)  aerobic respiration. 
D)  meiosis. 
E)  All of the answer choices are correct.

Question 9

The correct sequence for the phases of the cell cycle,starting with a newly divided cell,is

Accepted Answer

A)  cytokinesis - replication - interphase - mitosis. 
B)  interphase - mitosis - cytokinesis. 
C)  interphase - binary fission - cytokinesis. 
D)  replication - binary fission - cytokinesis. 
E)  cytokinesis - mitosis - interphase. 
A)  cytokinesis - replication - interphase - mitosis. 
B)  interphase - mitosis - cytokinesis. 
C)  interphase - binary fission - cytokinesis. 
D)  replication - binary fission - cytokinesis. 
E)  cytokinesis - mitosis - interphase.

Question 10

DNA replication is

Accepted Answer

A)  a one-step process. 
B)  not carried out in prokaryotic cells. 
C)  not carried out by enzymes. 
D)  conservative. 
E)  semi-conservative. 
A)  a one-step process. 
B)  not carried out in prokaryotic cells. 
C)  not carried out by enzymes. 
D)  conservative. 
E)  semi-conservative.

Question 11

In the biology lab,you observe three different animal cells under a microscope.In one cell,the nucleus is uniformly filled,with no distinct chromosome structure visible.In another,you see the nucleus with two nucleolus areas of more compact chromatin.A third cell is in mitosis,and distinct chromosome strands are visible.The value in packaging DNA in tighter forms of chromatin is for

Accepted Answer

A)  regulation and protection of the DNA during transcription. 
B)  Both answers regarding DNA mobility, protection and regulation in mitosis and transcription are correct. 
C)  prevention of ligase enzyme action during replication. 
D)  mobility and protection of the DNA molecule during mitosis. 
E)  insuring that sister chromatids will be attached prior to replication. 
A)  regulation and protection of the DNA during transcription. 
B)  Both answers regarding DNA mobility, protection and regulation in mitosis and transcription are correct. 
C)  prevention of ligase enzyme action during replication. 
D)  mobility and protection of the DNA molecule during mitosis. 
E)  insuring that sister chromatids will be attached prior to replication.

Question 12

Figuer:
This diagram shows how DNA is packaged and folded with its associated protective and regulatory proteins.  
-DNA is packaged to protect and manage the genetic information of the cell.What is the correct comparison between the packaging units of DNA?

Accepted Answer

A)  While chromatin is the collective term for the substance of DNA and associated proteins, chromosomes are the distinct units that are compact and visible during cell division. 
B)  While chromosome is the collective term for the substance of DNA and associated proteins, chromatin is the fluid and other molecules in the nucleus, that regulate cell division. 
C)  While the nucleus contains chromatin substance in general, the nucleosome is a secondary compartment that forms prior to cell division, as a location where chromosomes will replicate and divide. 
D)  Chromosomes are the distinct folded units containing the DNA molecule, while chromatin in the nucleosome is the location of the associated proteins. 
E)  The histones are protective proteins in chromatids, but the nucleosomes and centromeres are part of the actively dividing chromosomes. 
A)  While chromatin is the collective term for the substance of DNA and associated proteins, chromosomes are the distinct units that are compact and visible during cell division. 
B)  While chromosome is the collective term for the substance of DNA and associated proteins, chromatin is the fluid and other molecules in the nucleus, that regulate cell division. 
C)  While the nucleus contains chromatin substance in general, the nucleosome is a secondary compartment that forms prior to cell division, as a location where chromosomes will replicate and divide. 
D)  Chromosomes are the distinct folded units containing the DNA molecule, while chromatin in the nucleosome is the location of the associated proteins. 
E)  The histones are protective proteins in chromatids, but the nucleosomes and centromeres are part of the actively dividing chromosomes.

Question 13

Meiosis is a process used for

Accepted Answer

A)  growth of an organism. 
B)  repair of damaged cells. 
C)  production of gametes. 
D)  asexual reproduction. 
E)  production of stem cells. 
A)  growth of an organism. 
B)  repair of damaged cells. 
C)  production of gametes. 
D)  asexual reproduction. 
E)  production of stem cells.

Question 14

The complement strands of DNA have the same exact nitrogen base sequence,providing the semiconservative replication needed by cells.

Accepted Answer

A) True 
 B)False

Question 15

Sister chromatids are

Accepted Answer

A)  genetically identical and attached to each other at the centromere. 
B)  genetically different and attached to each other at the centromere. 
C)  genetically identical. 
D)  genetically different. 
E)  attached to each other at the centromere. 
A)  genetically identical and attached to each other at the centromere. 
B)  genetically different and attached to each other at the centromere. 
C)  genetically identical. 
D)  genetically different. 
E)  attached to each other at the centromere.

Question 16

Because prokaryotic cells do not go through interphase,mitosis,and cytokinesis,they do not replicate their DNA prior to division.

Accepted Answer

A) True 
 B)False

Question 17

Why does a replication fork have a leading and lagging strand?

Accepted Answer

A)  because DNA synthesis always goes from 5' to 3' 
B)  because DNA polymerase only attaches nucleotides to the 3' end of strands 
C)  because DNA synthesis can grow off of either the 3' or 5' end 
D)  because DNA synthesis always goes from 3' to 5' 
E)  Both answers, with DNA synthesis proceeding from 5' to 3', and DNA polymerase only acting on the 3' end, are correct. 
A)  because DNA synthesis always goes from 5' to 3' 
B)  because DNA polymerase only attaches nucleotides to the 3' end of strands 
C)  because DNA synthesis can grow off of either the 3' or 5' end 
D)  because DNA synthesis always goes from 3' to 5' 
E)  Both answers, with DNA synthesis proceeding from 5' to 3', and DNA polymerase only acting on the 3' end, are correct.

Question 18

Change in a cell's DNA sequence is a common occurrence in the process of replication.

Accepted Answer

A) True 
 B)False

Question 19

A human heart cell contains ___ chromatids.

Accepted Answer

A)  4 
B)  46 
C)  23 
D)  2 
E)  16 
A)  4 
B)  46 
C)  23 
D)  2 
E)  16

Question 20

In a biology lab exercise,you are asked to examine cells of a growing onion root tip,that has been sectioned to show many cells.In most of the cells,you easily see the circular or oval nucleus as a uniformly filled space in a membrane outline.In a small percentage of cells,you see chromosomes as distinct strands just as cell division begins,and as it progresses,because the chromatin

Accepted Answer

A)  becomes more tightly folded, increasing their visible length. 
B)  becomes less tightly folded, increasing their visible length. 
C)  becomes less tightly wound, to facilitate cell division. 
D)  becomes more tightly wound, to protect DNA, and to more easily manage cell division. 
E)  increases in length, as replication adds DNA sections to the original. 
A)  becomes more tightly folded, increasing their visible length. 
B)  becomes less tightly folded, increasing their visible length. 
C)  becomes less tightly wound, to facilitate cell division. 
D)  becomes more tightly wound, to protect DNA, and to more easily manage cell division. 
E)  increases in length, as replication adds DNA sections to the original.

Exam 8: DNA Replication, mitosis, and the Cell Cycle

Why don't plant cells form a cleavage furrow during cytokinesis?

Cyclophosphamide forms cross links between the two strands of DNA in a chromosome.How would this be effective in chemotherapy?

Replication takes place during the G1 phase of interphase.

How does the space between our fingers arise?

Complementary DNA strands are held together by

The enzyme that adds nucleotides along the 5' to 3' along a DNA strand,is

Figuer: This diagram shows how DNA is packaged and folded with its associated protective and regulatory proteins. -A part of a chromosome,that attaches sister chromatids to each other,defines the term

If scientists could increase telomerase production in specific cells,the primary reason for this would most likely be the stopping of

The correct sequence for the phases of the cell cycle,starting with a newly divided cell,is

DNA replication is

Figuer: This diagram shows how DNA is packaged and folded with its associated protective and regulatory proteins. -DNA is packaged to protect and manage the genetic information of the cell.What is the correct comparison between the packaging units of DNA?

Meiosis is a process used for

The complement strands of DNA have the same exact nitrogen base sequence,providing the semiconservative replication needed by cells.

Sister chromatids are

Because prokaryotic cells do not go through interphase,mitosis,and cytokinesis,they do not replicate their DNA prior to division.

Why does a replication fork have a leading and lagging strand?

Change in a cell's DNA sequence is a common occurrence in the process of replication.

A human heart cell contains ___ chromatids.

The Scientific Study of Life

The Chemistry of Life

Cell Structure and Function

The Energy of Life

Photosynthesis

How Cells Release Energy

DNA Structure and Gene Function

Sexual Reproduction and Meiosis

Patterns of Inheritance

DNA Technology

The Forces of Evolutionary Change

Evidence of Evolution

Speciation and Extinction

The Origin and History of Life

Viruses

Bacteria and Archaea

Protists

Plants

Fungi

Animals

Plant Form and Function

Plant Nutrition and Transport

Reproduction and Development of Flowering Plants

Animal Tissues and Organ Systems

The Nervous System

The Senses

The Endocrine System

The Skeletal and Muscular Systems

The Circulatory System

The Respiratory System

Digestion and Nutrition

Regulation of Temperature and Body Fluids

The Immune System

Animal Reproduction and Development

Animal Behavior

Population Ecology

Communities and Ecosystems

Biomes

Preserving Biodiversity

Filters

Replication takes place during the G₁ phase of interphase.