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Biology 151 Week 1 of notes

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by: Erin Swanson

Biology 151 Week 1 of notes BIO 151

Marketplace > University of North Dakota > Biology > BIO 151 > Biology 151 Week 1 of notes
Erin Swanson
GPA 3.0

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Hey guys, This is the first week of notes where we talked about XYZ
General Biology II
Professor Manu
Class Notes
Biology, dna. genetics, life, organisms. general biology
25 ?




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"You can bet I'll be grabbing Erin studyguide for finals. Couldn't have made it this week without your help!"
Adriel Powlowski DVM

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This 3 page Class Notes was uploaded by Erin Swanson on Monday February 1, 2016. The Class Notes belongs to BIO 151 at University of North Dakota taught by Professor Manu in Spring 2016. Since its upload, it has received 27 views. For similar materials see General Biology II in Biology at University of North Dakota.


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You can bet I'll be grabbing Erin studyguide for finals. Couldn't have made it this week without your help!

-Adriel Powlowski DVM


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Date Created: 02/01/16
Biol 151: General Biology II Spring 2016 The Meselson­Stahl Experiment Instructions: 1. Work in groups of 2-3 (pods) 2. Download Word document from BB 3. Write answers in document 4. Upload to BB test with group member names Please ensure that participating members’ names are listed in the blackboard test. Only persons whose names are listed will receive credit. Objective: To understand and predict outcomes of early experiments that elucidated  DNA’s structure and function. What was the main question that this experiment addressed? To test how DNA was copied.  Hypotheses: Semi­conservative replication: The old “parental” DNA strands serves as a template for a new daughter molecule. It is  called semi­conservative, because the new DNA molecule contains ½ of the old strand,  and a new strand. Conservative replication: The bases of the parental strand turns away and acts as a template for the new daughter  molecule. It’s called conservative, because the new DNA molecule is 100% new. Dispersive replication: The parental double helix is cut whenever 1 strand crossed over and DNA is then  synthesized in short sections by extending each of the parent’s cut to the next crossover\,  resulting in a mix of new and old DNA strands. Experimental Design: Label the steps, answer the questions. What is the difference between  N and  N? 15N has 1 more neutron, causing it to become heavier, and therefore have a larger  density. Page 1 of 3 Biol 151: General Biology II Spring 2016 There are four steps above. What is the reason for doing each of the steps? 1.  2. 3. 4. To separate components to find  There are three possible weights for the DNA from these samples. Light = all made of  N 14 15 Medium = hybrid molecules of  N &  N Heavy = all  N What was the weight of DNA at the beginning of the experiment (Step 1)? Heavy 14 Only  N was used after the initial step. What are the weights of DNA after one round of  replication for the three possible hypotheses? Seminconservative: Medium, Conservative: 1/2 light and ½ heavy Disruptive: Medium After a second round of replication, what are the weights of DNA for the three possible  hypotheses (remember, only  N is used)? Seminconservative: 1/2medium, ½ light Conservative: ¾ light, ¼ heavy Disruptive: medium Page 2 of 3 Biol 151: General Biology II Spring 2016 Draw the results of the experiment for each of the three possible hypotheses (as in the  book, p. 288). Which hypothesis matches the actual results given in the book? Semi­conservative model What BIG QUESTION did this answer? How DNA is copied. Page 3 of 3


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