Review how the process of DNA replication occurs.

Deoxyribonucleic acid (DNA) is located in the nucleus of the cell and is the genetic material in the cell. In order for cells to undergo mitosis and meiosis, the cells must be capable of copying their DNA. In the assignment this week, we will review how the process of DNA replication occurs.

  1. DNA consists of two polynucleotide chains that run in opposite directions. This opposing orientation of the two strands makes them _______________________.
  2. The building blocks of DNA are called nucleotides. Circle one nucleotide on the diagram above.
  3. Each nucleotide consist of three components __________________, _______________________, and ______________________. Label an example of each component on the diagram above.
  4. There are four nitrogenous bases in DNA. These bases are either single ring structures, called __________________, or 2-ring structures, called ________________.
  5. Complementary base pairs maintain the constant width of the double helix of DNA. Name the complementary base pairs of DNA.


  1. An experiment conducted by __________________________ demonstrated the DNA replication is _________________, which means that the replicated DNA contains one new strand of DNA and one old strand of DNA.
  2. DNA replication occurs during the ____________________ phase of the cell cycle.
  3. In the image above, label the leading strand, lagging strand, primase, single strand binding proteins, and helicase. Draw an arrow to indicate the direction of replication.
  4. The lagging strand is synthesized continuously/discontinuously (Circle one). Why is it synthesized in this manner?
  • Name the enzyme that performs each function.

_______________ Unwinds the DNA double helix

_______________Binds Okazaki fragments

_______________ Forms new DNA strands by adding complementary bases

_______________ Stabilizes the DNA molecule during replication

_______________ Makes a short section of RNA on the DNA template

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