A molecular probe might be used to

Options

A. insert gene into a host cell
B. make DNA for gene cloning
C. find a nucleotide sequence
D. cut down pieces of DNA to manageable size

Answer

### Step-by-Step Solution:

1. **Understanding Molecular Probes**:
- A molecular probe is a fragment of DNA or RNA that is labeled with a detectable marker (like a fluorescent dye or radioactive isotope) and is used to detect the presence of complementary sequences in a sample.
- Probes are essential tools in molecular biology for studying specific genes or sequences.

2. **Functions of Molecular Probes**:
- Molecular probes can be used for various purposes, including:
- Inserting genes into host cells.
- Making DNA for DNA cloning.
- Finding specific nucleotide sequences.
- Cutting DNA into manageable pieces.

3. **Identifying the Correct Use**:
- Among the listed functions, the most relevant use of a molecular probe is to "make DNA for gene cloning." This is because probes are often used in the process of hybridization, which is crucial for cloning specific DNA sequences.

4. **Conclusion**:
- Therefore, the correct answer to the question "A molecular probe might be used to" is to "make DNA for DNA cloning."