1107LWk9RameshA

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1107L

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Biology

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Jan 9, 2024

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BIOL 1107L Restriction Enzymes Worksheet Complete this assignment in tandem with the lab. Please read through all posted content on eLC for further information. Using what you’ve learned about restriction enzymes (RE) answer the following questions to determine the identity of unknown primers used for a PCR reaction with Lambda DNA ( DNA). Below is the map of DNA and the cut sites for the (RE) Eco RI and Hind III along with the standard DNA ladder information, these will be helpful in solving this puzzle. Figure 1 Restriction enzyme map detailing the cut sites of HindIII and EcoRI on Lambda DNA The table below shows three primers for PCR targeting specific DNA regions. For each primer set, region” refers to the numbered base pai r areas of DNA (total of 48,502 linear bp) that are copied using the primer target sequences. Table 1 Order manifest detailing the regions that each primer set will amplify on Lambda DNA Set (Amplified region of DNA bps) Forward Primer Sequence Reverse Sequence 1 (23,449-26,893) 5’-AGC GTA TTA GCG ACC CAT CGT CTT-3’ 5’-AAG GCA TTC CGA GCA GAT GGT-3’ 2 (22,985-27,342) 5’-CTC TGT CAG CTG CAT AAC GCC AAA-3’ 5’-TGT TAT GAG GGA GCG GAA GTT-3’ 3 (35,454-40,049) 5’-AAT CGC ACT TAC GGC CAA TGC TTC-3’ 5’-CAG CCA GTA GTG GGC GTT TGA TTT-3’ 1. Given the information above, and referring to the DNA map, record the length of the PCR product for each primer set in base pairs (bp) from last week. Calculate the size (bp) of the fragment(s) when cut with Eco RI or Hind III and complete the table below. (3 pts) Unknown PCR Product (bp) Eco RI Fragment(s) (bp) Hind III Fragment(s) (bp) Primer Set #1 3444 2655, 789 1708,1736 Primer Set #2 4357 3119, 1238 145, 2027, 2185 Primer Set #3 4595 3714, 881 1441, 564, 2590 2. Explain the importance of including both the uncut PCR product and a standard on the gel for analysis. (1 pt)
BIOL 1107L Restriction Enzymes Worksheet In lab, the RE digests of Eco RI and Hind III were performed on two separate samples of DNA. Multiple RE can be used on a single DNA sample at the same time, when using two RE simultaneously, it is referred to as a double digest . 3. Refer back to the restriction map at the beginning of this assignment. How many fragments would you have if you performed a double digest with Eco RI and Hind III and what would be the range of size (bp) of the fragments? (2 pts) There would be 10 fragments of DNA. The fragments’ lengths would be 1226 1904 2027 947 1375 4268 5148 564 1709 832 4. How many nanograms of Lambda DNA will be in the restriction enzyme reaction? (1 pt) 4 μL = 4ng DNA 5. Describe how the following conditions would affect the RE products and explain your reasoning. Use the RE protocol posted in eLC for reference. (3 pts) A reaction time of 15 minutes instead of 30 minutes The enzymes would not have enough time to complete the reaction. An incubation temperature set at 60 °C The enzymes could potentially denature.
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