Life on Earth
Chapter 10
DNA: The Molecule of Heredity
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  1. If you wanted to label amino acids but not DNA, which of the following radioactive isotopes would you use?
    1. 18F
    2. 35S
    3. 14C
    4. 3H
    5. 32P

  2. Whose pioneering work on the gene used the bacteriophage to show that DNA was the part of this virus that went into the bacterial cell for replication?
    1. Watson and Crick
    2. Avery
    3. Hershey and Chase
    4. Griffith
    5. Beadle and Tatum

  3. Knowing what you now know about RNA, DNA, and DNA replication from this chapter and mitosis from the last chapter, sister chromatids
    1. each have one single strand of the two complementary DNA strands
    2. each have a fully formed double helix of DNA
    3. are the same as the homologous chromosomes of a diploid cell
    4. are present in bacteriophages, bacteria, and eukaryotes
    5. none of the above

  4. How many different possible base sequences are there in a nucleotide chain 3 bases long?
    1. 1
    2. 3
    3. 9
    4. 64
    5. more than 64

  5. Chargaff, in analyzing DNA, found that the amount of
    1. cytosine equaled that of guanine
    2. cytosine equaled that of thymine
    3. cytosine equaled that of adenine
    4. each nucleotide was unrelated
    5. There is no relationship between the nucleotide bases.

  6. Semiconservative replication refers to the fact that
    1. Genetic information is contained in the transforming molecule.
    2. Only the DNA of the bacteriophage enters the bacterial cell.
    3. Certain bases pair with specific bases.
    4. One DNA strand remains while a new one is made.
    5. Point mutations sometimes interfere with accurate replication.

  7. DNA has which of the following:
    1. A, U, G, and C bases
    2. only C and T pyrimidine bases
    3. only A and G purine bases
    4. C and T pyrimidine bases and A and G purine bases
    5. both U and T bases

  8. The DNA of a certain organism has guanine as 30% of its bases. What percentage of its bases would be adenine?
    1. 0%
    2. 10%
    3. 20%
    4. 30%
    5. 40%

  9. Identify the correct structure of a nucleotide of DNA:
    1. phosphate-ribose-adenine
    2. phospholipid-sugar-base
    3. phosphate-sugar-phosphate-sugar
    4. adenine-thymine and guanine-cytosine
    5. base-phosphate-sugar

  10. In Griffith's experiment, the disease causing bacterial cells were from a strain that had
    1. been exposed to diseased mice
    2. been heat-killed
    3. a rough appearance under the microscope
    4. an outer polysaccharide capsule
    5. no polysaccharide capsule

  11. The phenomenon whereby a small piece of DNA is taken up and incorporated into another cell's chromosome is called
    1. translation
    2. transmission
    3. transcription
    4. transformation
    5. integration

  12. The bacteriophage experiments of Hershey and Chase showed that _____________________makes up the hereditary material of cells.
    1. protein
    2. DNA
    3. a virus
    4. radioactive material
    5. phosphorous only

  13. In what ways did Watson and Crick's model of DNA help to explain and define DNA replication?
    1. Deoxyribose sugar always bonds to a nitrogenous base.
    2. Precise base pairing allows the base sequence to be copied.
    3. Phosphate groups always bond to deoxyribose sugar.
    4. The number of purines equals the number of pyrimidines.
    5. Four types of bases are found in DNA.

  14. Select the correct definition of semiconservative DNA replication
    1. The old DNA is completely broken down.
    2. The old DNA remains completely intact.
    3. A pairs with T and G pairs with C.
    4. Only half of the DNA is replicated.
    5. Each new DNA molecule has half of the old one.

      


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