ЗА. This DNA after Bsal digestion, produces a DNA fragment with sticky ends as shown in the figure to the right. That is, the fragment has: Below is shown a double stranded DNA with some bases labeled as N's. 5- GTAG CGAC - 5 - a 5' GTAG sticky end on the left - a 5' CAGC sticky end on the right. Replace the N's below with the specific double stranded sequences that would need to be present on each end to obtain the desired sticky ends after Bsal digestion. Include Bsal and sticky end sequences in your answer. The recognition sequence for Bsal is in the lab manual. There are more "N" bases shown below than are needed. You can remove the extra ones or just leave them. 5- NNNNNNNNNNNNNNN NNNNNNNNNNNNNNN - 3' | 3-ΝNN NNN NNNNΝN NNNNNΝΝNNNNΝNN -5

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### DNA Fragment Sticky End Exercise

**Objective:** Understand the generation of sticky ends in DNA after BsaI digestion.

**Problem Statement:**
Below is a description of a double-stranded DNA sequence. After digestion with the BsaI enzyme, this DNA fragment will have sticky ends as shown in the diagram:

- **5’ GTAG** sticky end on the left
- **5’ CAGC** sticky end on the right

**Task:**
Replace the “N” bases in the provided sequence with specific double-stranded sequences. These sequences should ensure the correct sticky ends are formed post BsaI digestion. Include the BsaI recognition sequence and sticky end sequences in your answer.

**Example DNA Sequence with Sticky Ends:**

- **5’ End:**
  - Original: `5’ GTAG`
  - Sticky end planned: `5’ CAGC`

- **Sequence Template:**
  ```
  5’ - NNNNNNNNNNNNNNNN ... NNNNNNNNNNNNNNNN - 3’
  3’ - NNNNNNNNNNNNNNNN ... NNNNNNNNNNNNNNNN - 5’
  ```

**Instructions:**
1. Identify the BsaI recognition sequences in your lab manual.
2. Modify the “N” bases to incorporate these sequences, ensuring the correct formation of the sticky ends:
   - **Left:** Add nucleotides to create the 5’ GTAG sticky end.
   - **Right:** Add nucleotides to create the 5’ CAGC sticky end.

Feel free to either remove or include extra “N” bases as needed for clarity.

### Diagram Explanation:
The diagram shows the DNA orientation and the expected sticky ends resulting from BsaI enzyme digestion. You start with sequences labeled as "N" bases, and your goal is to modify them according to the given task, ensuring proper sticky ends are achieved.
Transcribed Image Text:### DNA Fragment Sticky End Exercise **Objective:** Understand the generation of sticky ends in DNA after BsaI digestion. **Problem Statement:** Below is a description of a double-stranded DNA sequence. After digestion with the BsaI enzyme, this DNA fragment will have sticky ends as shown in the diagram: - **5’ GTAG** sticky end on the left - **5’ CAGC** sticky end on the right **Task:** Replace the “N” bases in the provided sequence with specific double-stranded sequences. These sequences should ensure the correct sticky ends are formed post BsaI digestion. Include the BsaI recognition sequence and sticky end sequences in your answer. **Example DNA Sequence with Sticky Ends:** - **5’ End:** - Original: `5’ GTAG` - Sticky end planned: `5’ CAGC` - **Sequence Template:** ``` 5’ - NNNNNNNNNNNNNNNN ... NNNNNNNNNNNNNNNN - 3’ 3’ - NNNNNNNNNNNNNNNN ... NNNNNNNNNNNNNNNN - 5’ ``` **Instructions:** 1. Identify the BsaI recognition sequences in your lab manual. 2. Modify the “N” bases to incorporate these sequences, ensuring the correct formation of the sticky ends: - **Left:** Add nucleotides to create the 5’ GTAG sticky end. - **Right:** Add nucleotides to create the 5’ CAGC sticky end. Feel free to either remove or include extra “N” bases as needed for clarity. ### Diagram Explanation: The diagram shows the DNA orientation and the expected sticky ends resulting from BsaI enzyme digestion. You start with sequences labeled as "N" bases, and your goal is to modify them according to the given task, ensuring proper sticky ends are achieved.
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