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Michal Kreiselman

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Building DNA

Construct a DNA molecule, examine its double-helix structure, and then go through the DNA replication process. Learn how each component fits into a DNA molecule, and see how a unique, self-replicating code can be created.

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Assessment Questions (5):

Which pair of nitrogen bases will form a bond in a DNA molecule?
- A. cytosine and adenine
- B. adenine and thymine
- C. guanine and thymine
- D. thymine and cytosine
What three components make up a nucleotide?
- A. a deoxyribose, a phosphate, and an enzyme
- B. a phosphate, an enzyme, and a nitrogen base
- C. an enzyme, a deoxyribose, and a nitrogen base
- D. a phosphate, a deoxyribose, and a nitrogen base
3. Which nitrogen bases are needed to complete the DNA strand pictured below? Give your answer in order, from top to bottom.
- A. thymine, adenine, guanine, cytosine
- B. adenine, thymine, guanine, cytosine
- C. adenine, thymine, cytosine, guanine
- D. cytosine, guanine, thymine, adenine
When one DNA molecule is replicated, the result is two DNA molecules. What is true of the second DNA molecule?
- A. It is identical or nearly identical to the first DNA molecule.
- B. The sequence of bases, from top to bottom, is opposite the sequence in the first DNA molecule.
- C. It is half the size of the first DNA molecule.
- D. It is twice the size of the first DNA molecule.
What is the role of enzymes in the DNA replication process?
- A. Enzymes read the DNA code and build a new DNA molecule from scratch.
- B. Enzymes link together to form a template for a new DNA molecule to be built.
- C. Enzymes split the DNA molecule into two rails and then transport corresponding nitrogen bases to each rail.
- D. Enzymes link adjacent nucleosides together, becoming an integral part of the structure of the new strands of DNA.

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