39. Name the laboratory technique that separates DNA fragments based on size.    40. Depressions in the gel (enclosed by box) where samples are loaded are called ______________.

25. The subunits of DNA are called _______________________. 26. Is the net charge of DNA positive or negative?  

31. Identify part A of the micropipette.    32.  Identify part B of the micropipette.   

7. The curved surface of the liquid in a graduated cylinder is called a ________________. 8.  What is the amount of liquid in this picture?  (Make sure you use the correct units)

35. During this step of PCR reactions, primers bind to single-stranded DNA.    36. During this step of PCR reactions, DNA polymerase synthesizes new DNA strands. 

1. Convert 1,000 grams to kilograms. 2. Given that the mass of water is 1gram/ml, what is the mass of 100ml of water?

29. The symbol for microliters is _________________.   30. Convert 1,000 milliliters to microliters. [b] Do not forget the units! Measurements without units will be marked incorrect.

3. What is the base unit of length in the metric system? 4. Convert 100 centimeters to meters.

19. Which centrifuge is balanced? A, B, or C?   20. After the cell lysis mixture is centrifuged, the liquid at the top of the tube is called ______________.

41. What is the name of the restriction enzyme used on the TAS2R38 gene?     42. Why do we perform a restrcition digest on our PCR amplified TAS2R38 gene?