Biology DNA: The Genetic ?· PowerPoint Notes on Chapter 9 ... including certain bacteria. ... The Genetic Material. Holt Biology DNA: The Genetic Material., DNA. 12 ...

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  • Name ____________________________________________________________ Period ______


    DNA: The Genetic Material

  • Date Assignment Points Earned Possible Points

    Chapter 9 Vocabulary 13

    Chapter 9 Notes

    Chapter 9 Questions

    Directed Reading 9-2

    DNA Structure Skills Worksheet

    Biology Homework: DNA/Concept Map

    Directed Reading 9-3

    Active Reading 9-3

  • Chapter 9 DNA: The Genetic Material

    Vocabulary Use the glossary and dont shorten the definition. If a page number is listed, use that page to

    define the term.

    Section 1: Identifying the Genetic Material

    1. vaccine -

    2. virulent

    3. transformation

    4. bacteriophage

    Section 2: The Structure of DNA

    5. double helix

    6. nucleotide

    7. deoxyribose

    8. base-pairing rules

    9. complementary base pair

    Section 3: The Replication of DNA

    10. DNA replication

    11. DNA helicase

    12. replication fork

    13. DNA polymerase

  • PowerPoint Notes on Chapter 9 - DNA: The Genetic Material Section 1 Identifying the Genetic Material Objectives

    Relate Griffiths conclusions to the observations he made during the transformation experiments.

    Summarize the steps involved in Averys transformation experiments, and state the results.

    Evaluate the results of the Hershey and Chase experiment.

    Transformation : Griffiths Experiments

    In 1928, ______________________________, a bacteriologist, was trying to prepare a

    ____________________ against pneumonia.

    A vaccine is a substance that is prepared from _______________ or _______________

    disease causing agents, including certain bacteria.

    The vaccine is introduced into the body to _________________ the _______________

    against future infections by the disease-causing agent.

    Griffith discovered that ___________________ bacteria could turn virulent when mixed

    with bacteria that cause disease.

    A bacteria that is virulent is _____________________________________.

    Griffith had discovered what is now called _______________________, a change in

    genotype caused when cells take up foreign genetic material.

    Griffiths Discovery of


    Transformation: Averys Experiments

    In 1944, a series of experiments showed:

    o The activity of the material responsible for transformation is not affected by

    _______________-destroying enzymes.

    o HOWEVER, the activity IS stopped by a ________ -destroying enzyme.

    Thus, almost 100 years after Mendels experiments, Oswald Avery and his co-workers

    demonstrated that __________ is the material responsible for transformation.

  • Viral Genes and DNA: DNAs Role Revealed

    In 1952, Alfred Hershey and Martha Chase used the

    bacteriophage T2 to prove that ___________ carried

    genetic material.

    A ___________________, also referred to as a phage, is

    a _______________ that infects bacteria.

    When phages infect bacterial cells, the phages are able

    to ______________________________, which are

    released when the bacterial cells rupture.

    Hershey and Chase carried out the following


    o Step 1 T2 phages were labeled

    with _______________________.

    o Step 2 The phages infect E. coli

    bacterial cells.

    o Step 3 Bacterial cells were spun to

    remove the virus's ____________


    Hershey and Chase concluded that the

    _________ of viruses is injected into the

    bacterial cells, while most of the _______

    __________________ remain outside.

    The injected DNA molecules cause the

    bacterial cells to produce more ________

    _________ and proteins.

    This meant that the DNA, rather than

    proteins, __________________________

    _________________, at least in viruses.

    Section 2 The Structure of DNA


    Describe the three components of a nucleotide.

    Develop a model of the structure of a DNA molecule.

    Evaluate the contributions of Chargaff, Franklin, and Wilkins in helping Watson and Crick determine the double-helical structure of DNA.

    Relate the role of the base-pairing rules to the structure of DNA.

  • A Winding Staircase

    Watson and Crick determined that a DNA molecule is a ____________________ two

    strands twisted around each other, like a winding staircase.

    _______________________ are the subunits that make up DNA. Each nucleotide is

    made of three parts: a phosphate group, a five-carbon sugar molecule, and a nitrogen-

    containing base.

    The five-carbon sugar in DNA nucleotides is called ____________________________.

    The nitrogen base in a nucleotide can be either a bulky, _________________________,

    or a smaller, _______________________________.

    Structure of a Nucleotide

  • Discovering DNAs Structure:

    Chargaffs Observations

    In 1949, Erwin Chargaff observed that for each organism he studied, the amount of

    _______________ always equaled the amount of ________________ (A=T).

    Likewise, the amount of ______________ always equaled the amount of ____________


    However, the amount of adenine and thymine and of guanine and cytosine __________

    between different organisms.

    Wilkins and Franklins Photographs

    By analyzing the complex patterns on


    photo, scientists can determine the

    structure of the molecule.

    In 1952, Maurice Wilkins and Rosalind

    Franklin developed high-quality _________

    diffraction photographs of strands of _____.

    These photographs suggested that the DNA

    molecule resembled a tightly coiled ____________ and was composed of two or three

    chains of ______________________.

    Watson and Cricks DNA Model

    In 1953, Watson and Crick built a model of DNA with the configuration of a __________

    ________________, a spiral staircase of two strands of nucleotides twisting around a

    central axis.

    The double-helical model of DNA takes into account __________________ observations

    and the __________________ on Franklins X-ray diffraction photographs.

    Pairing Between Bases

    An _________________ on one strand always pairs with a ______________ on the

    opposite strand, and a _______________ on one strand always pairs with a _________

    on the opposite strand.

    These _________-_____________________________ are supported by Chargaffs


    The strictness of base-pairing results in two strands that contain ___________________


  • The diagram of DNA below the helix makes it easier to visualize the base-pairing that

    occurs between DNA strands.

    *3 Things that determine how DNA base pairs bond:

    1. ________________________

    2. ________________________

    3. ________________________

    Section 3 The Replication of DNA Objectives

    Summarize the process of DNA replication.

    Describe how errors are corrected during DNA replication.

    Compare the number of replication forks in prokaryotic and eukaryotic DNA.

    Roles of Enzymes in DNA Replication

    The complementary structure of DNA is used as a basis to ______________________


    The process of making a copy of DNA is called _________________________.

    DNA replication occurs during the ____________________ phase of the cell cycle,

    before a cell divides.

    DNA replication occurs in three steps:

    o Step 1 ________________________________opens the double helix by breaking

    the _____________ bonds that link the complementary nitrogen bases between the

    two strands. The areas where the double helix separates are called


    o Step 2 At the replication fork, enzymes known as ___________________________

    move along each of the DNA strands. DNA polymerases add __________________

    to the exposed nitrogen bases, according to the ________________________ rules.

    o Step 3 Two ________ molecules form that are _________________ to the original

    DNA molecule.

  • Checking for Errors

    In the course of DNA replication, _________________________ sometimes occur and

    the wrong ___________________________ is added to the new strand.

    An important feature of DNA _______________________ is that DNA polymerases

    have a ____________________________ role.

    This proofreading reduces errors in DNA replication to about _______________ error

    per 1 billion nucleotides.

    The Rate of Replication

    Replication does NOT begin at one end of the DNA molecule and end at the other.

    The ____________________ DNA molecules found in ________________________

    usually have two replication forks that begin at a single point.

    The replication forks move away from each other until they meet on the opposite side of

    the DNA circle.

    In ________________________ cells, each chromosome contains a single, long strand

    of DNA.

    Each _______________________ chromosome is replicated in about 100 sections that

    are 100,000 ___________________________ long, EACH section with its own starting


    With multiple replication forks working in concert, an entire human chromosome can be

    replicated in about ____________ hours.

    Replication Forks Increase the Speed of Replication

  • Chapter 9 Section 1 Questions

    1. What question did Mendels experiments answer?

    2. What question did Mendels experiment create?

    3. What was Frederick Griffith trying to find in his experiments?

    4. How does a vaccine work?

    5. How were the two types of bacteria different in Griffiths experiments?

    Strain #1(S bacteria)-

    Strain #2 (R bacteria)--

    6. What happened when Griffith injected the mice with S bacteria?

    7. What happened when Griffith injected the mice with R bacteria?

    8. What happened when Griffith injected the mice with heated-killed S bacteria?

    9. What happened when Griffith injected the mice with heated-killed S bacteria

    and live R bacteria?

    10. How did Griffith explain what happened in his experiment?

    11. What did Oswald Avery discover?

    12. What did Hershey and Chase conclude from their experiments?

    Chapter 9 Section 2 Questions

    1. What was the importance of discovering DNAs structure?

    2. What is meant by double helix?

    3. Who discovered the structure of the DNA molecule?

    4. What are the three parts of the nucleotide?




    5. What is the five carbon sugar in DNA called?

    6. What parts of the DNA nucleotide remains the same?

    7. What part changes in DNA nucleotide?

  • 8. What are the four different nitrogen bases in DNA?





    9. What type of bond holds the two strands of the double helix together?

    10. How did Erwin Chargaff contribute to Watson and Cricks discovery?

    11. How did Maurice Wilkins and Rosalind contribute to Watson and Cricks


    12. What does adenine always pair with?

    13. What does guanine always pair with?

    14. What does cytosine always pair with?

    15. What does thymine always pair with?

    Chapter 9 Section 3 Questions

    1. When does DNA replication occur during the cell cycle?

    2. What enzyme opens the DNAs double helix by breaking the hydrogen bonds?

    3. What is the area where the double helix is held apart called?

    4. What enzyme adds the new nucleotides to the original DNA strand?

    5. What enzyme is responsible for proof-reading the new DNA strands?

    6. How many replication forks does prokaryotic DNA have?

    7. How many replication forks does eukaryotic DNA have?

  • Copyright by Holt, Rinehart and Winston. All rights reserved.

    Holt Biology 3 DNA: The Genetic Material

    Section: The Structure of DNAIn the space provided, write the letter of the description that best matches the

    term or phrase.

    ______ 1. double helix

    ______ 2. nucleotides

    ______ 3. deoxyribose

    ______ 4. DNA

    ______ 5. hydrogen bond

    ______ 6. nitrogen base

    ______ 7. adenine

    ______ 8. cytosine

    In the space provided, explain how the terms in each pair are related to

    each other.

    9. base-pairing rules, complementary

    10. adenine, thymine

    11. cytosine, guanine

    Name Class Date

    Directed ReadingSkills Worksheet

    a. a five-carbon sugar

    b. type of bond that holds the double helix together

    c. one of three parts of a nucleotide made of one or two rings of carbon

    and nitrogen atoms

    d. subunits that make up DNA

    e. one of two pyrimidines used as a nitrogen base in nucleotides

    f. one of two purines used as a nitrogen base in nucleotides

    g. abbreviation for deoxyribonucleic acid

    h. two strands of nucleotides twisted around each other

    Chapter 9 Section 2 Pages 194-197

  • Copyright by Holt, Rinehart and Winston. All rights reserved.

    Holt Biology 4 DNA: The Genetic Material

    Name Class Date

    Directed Reading continued

    Read each question, and write your answer in the space provided.

    12. What was Chargaffs observation about the nitrogen bases in DNA?

    13. What role did the photographs of Wilkins and Franklin play in the discoveryof the structure of DNA?

    14. What did Watson and Crick deduce about the structure of DNA?

    Complete the Section Review questions on page 197, #1-6.

  • Copyright by Holt, Rinehart and Winston. All rights reserved.

    Holt Science: Biology 17 Science Skills Worksheets


    Use the figure below to answer questions 13.

    Read each question, and write your answer in the space provided.

    1. In the space provided, identify the structures labeled AE.

    A. _________________________________________________________________

    B. ____________________________________________________________________

    C. ____________________________________________________________________

    D. ____________________________________________________________________

    E. ____________________________________________________________________

    2. What do the lines connecting the two strands represent? Why are there threelines connecting the strands in some instances and only two lines in others?

    3. Suppose that a strand of DNA has the base sequence ATT-CCG. What is thebase sequence of the complementary strand?

    Name Class Date

    DNA StructureSkills Worksheet





  • Name ________________________________________________ Score ______ Period ______ Biology Homework: DNA 1. Draw a nucleotide and label its three basic parts. 2. Which parts make up the sides of the ladders? Which parts make up the rungs of the ladder? To which part do the rungs of the ladder attach on the sides? 3. What 2 parts do all nucleotides have in common? 4. What part of a nucleotide makes them different? 5. What is the base pair rule? Who discovered this idea? 6. What did Franklin and Wilkins x-ray diffraction photograph of strands of DNA suggest about the structure of the DNA molecule? 7. Using Chargaffs data and the x-ray diffraction photograph of DNA, who built the first model of DNA and describe its structure? 8. What 3 things determine which nitrogen bases pair with which? 9. Which of the 4 nitrogen bases are purines? Which of the 4 nitrogen bases are pyrimidines? 10. Use the base pair rule to complete the missing side of DNA. Pretend the list of nitrogen bases is an entire nucleotide. Match up the correct missing side of this DNA molecule. G G C T C C C T T T G C G C A A A A T G C T A T C G C C G G A A A T T G T C A

  • Copyright by Holt, Rinehart and Winston. All rights reserved.

    Holt Biology 17 DNA:...


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