If the enzyme Sma1 is used over a sequence, the ends produced will be described as :

Options

A. sticky ends
B. blunt ends
C. cohesive ends
D. both ( 1) and (2)

Answer

**Step-by-Step Solution:**

1. **Identify the Enzyme**: The enzyme mentioned in the question is Sma1. It is important to recognize that Sma1 is a type of restriction enzyme.

2. **Understand the Function of Restriction Enzymes**: Restriction enzymes are proteins that cut DNA at specific sequences known as recognition sites. They can create different types of ends depending on how they cut the DNA.

3. **Types of Cuts Made by Restriction Enzymes**: There are two main types of cuts made by restriction enzymes:
- **Sticky Ends (Cohesive Ends)**: These are produced when the enzyme cuts the DNA at a location that is not directly in the middle of the recognition site, leaving overhanging ends.
- **Blunt Ends**: These occur when the enzyme cuts the DNA directly in the middle of the recognition site, resulting in no overhangs.

4. **Determine the Type of Ends Produced by Sma1**: According to the information provided, Sma1 cuts the DNA at the center of the palindromic sequence, which results in blunt ends.

5. **Conclusion**: Therefore, if the enzyme Sma1 is used over a sequence, the ends produced will be described as **blunt ends**.

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