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Testing Your Knowledge
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1. If a cell contains all the genetic material it must have to carry out protein synthesis, why must the DNA also be replicated?

2. State the functions of the following enzymes that participate in DNA replication or repair:

  • a. Primase
  • b. DNA polymerase
  • c. Ligase
  • d. Helicase
  • e. Photolyase

    • 3. What part of the DNA molecule encodes information?

    4. Write the complementary sequence of a new strand of DNA replicated from each of the following parental base sequences:

  • a. TCGAGAATCTCGATT
  • b. CCGTATAGCCGGTAC
  • c. ATCGGATCGCTACTG

    • 5. List the steps of DNA replication.

    6. Choose an experiment mentioned in the chapter and analyze how it follows the scientific method.

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    Additional Questions

    1. Match the experiment or observation on the left to the concept it illustrates on the right:

    a. Solid bandages contain an acidic (1) A “transforming principle” transmits substance that includes nitrogen the ability of bacteria to cause and phosphorus. pneumonia in mice.
    b. “Blender experiments” showed that (2) Complementary base pairing is part the part of a virus that infects of DNA structure and maintains a bacteria contains phosphorus, but double helix of constant width. not sulfur.
    c. DNA contains equal amounts of  (3) Discovery of nuclein. G and C and of A and T.
    d. Type R bacteria transmit a substance (4) DNA is the hereditary material. that restores the ability of heat-killed type S bacteria to cause pneumonia in mice.

    2. Why is a disorder of DNA repair inherited?

    3. How is DNA polymerase involved in both DNA replication and DNA repair?

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