Restriction enzymes should not have more than one site of action in the cloning site of a vector. Comment.

Explanation

### Step-by-Step Solution:

1. **Understanding Restriction Enzymes**:
- Restriction enzymes, also known as molecular scissors, are proteins that cut DNA at specific sequences. They are classified as nucleases, which can be further divided into exonucleases and endonucleases. Exonucleases cut DNA at the ends, while endonucleases cut at specific internal sites.

2. **Cloning Vectors**:
- Cloning vectors are DNA molecules used to transport foreign genetic material into a host cell. They typically contain a cloning site where foreign DNA can be inserted.

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