Question 1

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.

Question 2

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.

Question 3

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.

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.

Question 5

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.

Question 6

Complementary DNA strands are held together by

Accepted Answer

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

Question 7

A human heart cell contains ___ chromatids.

Accepted Answer

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

Question 8

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 9

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.

Question 10

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. C

Question 11

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.

Question 12

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.

Question 13

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.

Question 14

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.

Question 15

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

Accepted Answer

A) True 
 B)False

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

Replication takes place during the G1 phase of interphase.

Accepted Answer

A) True 
 B)False  False

Question 18

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. E

Question 19

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.

Question 20

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.

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

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

Correct Answer
verified

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?

Correct Answer
verified

Correct Answer
verified

How does the space between our fingers arise?

Correct Answer
verified

Sister chromatids are

Correct Answer
verified

Complementary DNA strands are held together by

Correct Answer
verified

A human heart cell contains ___ chromatids.

Correct Answer
verified

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

Correct Answer
verified

Meiosis is a process used for

Correct Answer
verified

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

Correct Answer
verified
C

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

DNA replication is

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Replication takes place during the G₁ phase of interphase.

Correct Answer
verified
False

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

Correct Answer
verified
E

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

Correct Answer
verified

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

Correct Answer
verified

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

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How does the space between our fingers arise?

Correct AnswerverifiedShow Answer

Sister chromatids are

Correct AnswerverifiedShow Answer

Complementary DNA strands are held together by

Correct AnswerverifiedShow Answer

A human heart cell contains ___ chromatids.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Meiosis is a process used for

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

DNA replication is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Replication takes place during the G1 phase of interphase.

Correct AnswerverifiedFalse

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

Correct AnswerverifiedE

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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C

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Replication takes place during the G₁ phase of interphase.

Correct Answer
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False

Correct Answer
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E

Correct Answer
verified

Correct Answer
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