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

To solve the question regarding the enzyme Sma1 and the type of ends it produces, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Enzyme**: The question mentions the restriction enzyme Sma1. It is important to know what type of cuts this enzyme makes in DNA.

2. **Understand Types of Ends**: There are two main types of ends produced by restriction enzymes:
- **Sticky Ends**: These are ends with short single-stranded overhangs that can easily anneal with complementary sequences.
- **Blunt Ends**: These are straight cuts through the DNA, resulting in flat ends with no overhangs.

3. **Research Sma1**: Sma1 is known to produce blunt ends when it cuts DNA. This means that it does not leave any overhangs, and the ends of the DNA fragments are flat.

4. **Evaluate the Options**:
- Option 1: Sticky Ends - Incorrect, as Sma1 does not produce sticky ends.
- Option 2: Blunt Ends - Correct, as Sma1 produces blunt ends.
- Option 3: Cohesive Ends - Incorrect, as cohesive ends are another term for sticky ends.
- Option 4: Both 1st and 2nd - Incorrect, since only the second option is correct.

5. **Conclusion**: The correct answer is that the ends produced by the enzyme Sma1 are described as **Blunt Ends**.

### Final Answer:
The ends produced by the enzyme Sma1 are described as **Blunt Ends**.