Presentation on theme: "Do Now: Answer the pre-lab questions on"— Presentation transcript:
1Do Now: Answer the pre-lab questions on the front page of your handout.
2Learning Objectives: DNA Extraction By the end of this class, you will be able to:Make predictions about the appearance of DNADiscover and explain how we are able to remove DNA from cells and see it even though DNA is very small and can usually only be seen with a powerful microscopePredict traits that could be given to strawberries using biotechnologyDetermine that the leafy green part of strawberries appears so different from the red fleshy part of the strawberry due expression of different genes and not due to different genes existing in different parts of the plant
3Vocabulary Review Solution: a liquid mixture in which one substance is dissolved in another substance
4Vocabulary Review Soluble: able to dissolve in something. Example: Sugaris soluble in water
5Vocabulary Review3. Precipitate (noun): A solid substance that is not dissolved in a solution Precipitate (Verb): To cause a solid substance to separate from a solution
6Vocabulary Review3. Extract (noun): a solution obtained by steeping or soaking a solid in a liquid Extract (Verb): To remove or take out something
7Vocabulary Review Filter (noun): something that separates solids from liquidsFilter (verb): toremove solids from a liquid
8Vocabulary ReviewHistone Protein:A protein that DNAwinds around
9Vocabulary Review Phospholipid membrane: A cell membrane that is made up of two layersof phospholipids.Phospholipids have apolar (water-loving)head and a non-polarfatty tail.
10Vocabulary Review8. Biotechnology: Taking DNA from one organism and putting it into another organism
11Vocabulary Review Gene Expression: The conversion of the information encoded ina gene first into messengerRNA and then to a protein.Are all genes beingexpressed in an organismat all times?
12Vocabulary Review Knead: To mix and work into a uniform mass, as by folding, pressing, and stretching with the hands
13Vocabulary Review Analogy: a comparison between two things, usually on the basis of their structure and for the purpose of explanation or clarification
14Background Information The long strands of DNA store the genetic information of living things. DNA is present in every cell of plants, animals, and other living things, with one exception.What cells have no nucleus and therefore have no DNA?
15Background Information The DNA found in strawberry cells can be extracted using common materials. We will use a DNA extraction buffer. This extraction buffer will help us remove the DNA from the strawberry cells. It contains salt and soap.
16Background Information The salt breaks up the histone proteins that the DNA is wrapped around.Why would we need to break up these proteins before extracting the DNA from cells?
17Background Information The soap dissolves the phospholipid part of the strawberry cell and nuclear membranes.Why do we need to dissolve the cell and nuclear membranes before extracting the DNA?
18Laboratory SafetyNone of the chemicals or materials we will be using in this lab are particularly dangerous. However, you must be careful and follow a few basic rules:
19Laboratory Safety Rules 1. DO NOT EAT ANYTHING. I know the strawberries look delicious. Do not eat them. Today, they are not food, they are laboratory materials.2. BE CAREFUL WITH THE SCISSORS. Mrs. Campbell will demonstrate the correct way to hand somebody a pair of scissors.3. WASH YOUR HANDS after you have finished the lab activity.4. POUR LIQUIDS CAREFULLY. Do not splash any liquids on purpose. If you spill something, wipe it up with a wet paper towel, then wipe the surface again with a dry paper towel.
20Materials Check your lab station to make sure you have these items: Plastic zip-top bag1 strawberryDNA extraction buffergraduated cylindercheeseclothfunneltest tubetest tube rackwooden skewerice cold isopropyl alcoholscissors
21Breaking Laboratory Safety Rules Breaking the rules will cause you to lose your lab privileges. You will have to sit in a chair in the back of the room and watch everybody else do the lab. Continued disruptive behavior will earn you a referral.
22Modeling the Lab Procedure Watch Mrs. Campbell as she goes through all of the steps of the lab.
23Clean UpAfter you have finished the lab: -throw away the zip-top bag and the cheesecloth -dump the liquid from the test tube in the bucket that is next to the sink -place test tubes, funnels, and sticks in the appropriate bins by the sink -wipe down your table and wash your hands -start working on the Conclusions and Analysis questions -if you finish the Conclusions and Analysis questions, you may start your homework (the genetic engineering article and questions)