Question

Method 1. Remove the calyx (green leafy end) of the strawberry 2. Insert the strawberry into a zip lock bag and tightly seal the zip lock bag afterwards 3. Use your fingers to mash the strawberry until there aren't any large pieces remaining 4. Place a strainer on top a beaker and transfer the strawberry mixture into the beaker through the strainer. Use a spoon to push down the strawberry content through the strainer. Place this aside 5. Using another beaker, add 1/4 teaspoons of salt into 1/3 cup of cold water. Stir to combine the two. Wait 2 minutes before proceeding to the next step. 6. Add 2 teaspoon (10 ml) of detergent to the water and salt mixture. Stir to create the extraction mixture 7. Add the extraction mixture into the beaker which contains the strawberry. Mix the strawberry content with the extraction mixture to combine the two. 8. Add 5mL of pineapple juice to the beaker which contains the strawberry and extraction mixture. Stir gently. Wait 10 minutes before proceeding to the next step. 9. Insert the mixture into a test tube and fill it 1/3 of the way 10. Insert the same amount of 90% ethyl alcohol as the strawberry mixture. The test tube should be filled 2/3 of the way after the alcohol is added on top of the strawberry mixture 11. Let the test tube rest on the test-tube rack and wait for the DNA appear 12. Remove the DNA with a toothpick and place the DNA on a clean plate to observe 212

The time it takes for the DNA to reach the top what would the dependent, independent, and controlled variables be?  

Answer 1

Time taken by DNA to reach at the top - approximately 5 minutes

Dependent variables - extraction mixture

Independent variables - amount of strawberry used

Controlled variables- ethyl alcohol