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13.2 Notes Questions (DNA)

Last updated over 4 years ago
6 questions
Use your Notes on 13.2 - The Structure of DNA to answer the questions below. You may also, of course, refer back to the textbook Chapter 13 Lesson 2.
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1) How did Chargaff’s observations lead to the base-pairing rules for DNA?

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How were Wilkins and Franklin trying to find the structure of DNA? (What technique were they using?)

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Each nucleotide consists of three parts. Which part is different between the four different DNA nucleotides (A, T, G, and C)?

For the following (bottom) strand of nucleotides, fill in the complementary (top) strand. The first three nucleotides are done for you: (Use the base-pairing rules!)
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_________________________________________________________________________
T T A
A A T T C T C G G A A G C T T A C G C C C A A T T A G

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Look at Figure 13-6 in your book (this might be a good structure to have drawn in your notes!). What do you notice about the structure of guanine and adenine as compared to thymine and cytosine?

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Thinking Question (Ooooh...): Thinking about the base-pairing rules in DNA, and what you said about the structures in Question 5, why do you think it's important to the structure of DNA that they follow these rules?