AP BIO DNA EXTRACTION. COLLECT AND BREAK OPEN CELLS Get tube with 3 mL water and label with your initials. Place in test tube rack. GENTLY rub you teeth/tongue.

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Presentation transcript:

AP BIO DNA EXTRACTION

COLLECT AND BREAK OPEN CELLS Get tube with 3 mL water and label with your initials. Place in test tube rack. GENTLY rub you teeth/tongue against the inside of your cheeks for 30 seconds. DON’T chew so hard you draw BLOOD!

COLLECT AND BREAK OPEN CELLS Take the 3 mL water from the test tube into your mouth and swish it around vigorously for 30 seconds. Don’t swallow the water! Spit into cup provided. Use pipette to transfer liquid to test tube. Bio Rad Genes in a Bottle teacher guide

COLLECT AND BREAK OPEN CELLS Add 2 mL LYSIS BUFFER Place cap on tube and GENTLY invert 5 times. DO NOT SHAKE! Bio Rad Genes in a Bottle teacher guide

Remove proteins Add 5 DROPS of PROTEASE and SALT solution. What does the name tell you about what proteases do? Bio Rad Genes in a Bottle teacher guide Protease digests proteins

Add cap and GENTLY invert tube a 3 times. Place your tube in a test tube rack in the water bath and incubate at 50° C for 10 minutes to allow proteases to work Bio Rad Genes in a Bottle teacher guide

Soap – disrupts phobic phospholipids in cell membranes and releases DNA from cell Protease- gets rid of proteins associated with DNA and DNases (enzymes that digest DNA) Salt ions- surround charges on DNA and helps bring DNA together

Obtain a tube containing 91% isopropyl alcohol. Keep the alcohol as cold as possible by placing it in the cup of ice.

Making the DNA Visible Tilt tube at a 45° angle and slowly add the alcohol, carefully letting it flow GENTLY down the inside of the tube. Add about 10 ml total of cold alcohol. You may need to use several pipets full You should be able to see two layers (upper and lower) forming. As you add the alcohol, pay close attention to the place where the alcohol and cell extract layers meet. Bio Rad Genes in a Bottle teacher guide

Making the DNA Visible Place cap on tube and let it sit UNDISTURBED AT ROOM TEMP for 5 minutes to give time for DNA to precipitate.

Making the DNA Visible After 5 min, SLOWLY invert the tube 5 times to help DNA, which has begun to precipitate to aggregate. You should see DNA clumping together. Bio Rad Genes in a Bottle teacher guide

Use pipette to transfer the precipitated DNA along with 750-1µL of alcohol solution to the small glass vial provided. Use Superglue to seal the top on the vial. Add string before you close/glue the top.