Essay on Ch 16 17 Activity Homework Packey Key

3986 Words Dec 16th, 2014 16 Pages
Activity 16.1 Is the Hereditary Material DNA or Protein?

Accumulating and Analyzing the Evidence

Build a concept map to review the evidence used to determine that DNA was the genetic material, the structure of DNA, and its mode of replicaton. Keep in mind that there are many ways to construct a concept map.
First, develop a separate concept map for each set of terms (A to F on the next page). Begin by writing each term on a separate Post-it note or sheet of paper.
Then organize each set of terms into a map that indicates how the terms are associated or related.
Draw lines between the terms and add action phrases to the lines to indicate how the terms are related.

Here is an example:

4. After you have completed each of the
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If the researchers cultured these cells further, they could show that new viruses were produced. As a result, they demonstrated that it was the DNA in the viruses that was transferred to the bacteria and caused the production of new viruses. (There was arguably some protein contamination in these experiments, too, but by this time, enough evidence had accumulated that most were willing to accept this experiment as conclusively settling the argument—that is, showing that DNA is the hereditary material.)
2. Watson and Crick were the first to correctly describe the structure of DNA. What evidence did they use to do this? How did they use this evidence to put together or propose the structure of DNA?
Watson and Crick collected the following evidence:
Chargaff’s rule indicated that the amount of adenine in DNA was equal to the amount of thymine and that the amount of guanine was equal to the amount of cytosine.
The chemical structure of the four nucleotides was known. It was clear from their structure that adenine and thymine were each capable of forming two hydrogen bonds with other compounds and that guanine and cytosine were each capable of forming three hydrogen bonds.
Rosalind Franklin’s X-ray crystallography data allowed Watson and Crick to determine the width of the DNA molecule, the fact that it was helical, and the distance between turns on the helix.
Chemical analysis of

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