cDNA probes are copied from mRNA molecule with the help of :

Options

A. DNA polymerase
B. RNA polymerase
C. Reverse transcriptase
D. Taq polymerase

Answer

To answer the question, "cDNA probes are copied from mRNA molecules with the help of:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding cDNA**: cDNA stands for complementary DNA. It is synthesized from an mRNA template.

2. **Role of mRNA**: Messenger RNA (mRNA) carries the genetic information from DNA to the ribosome, where proteins are synthesized.

3. **Enzyme Involved**: The synthesis of cDNA from mRNA is catalyzed by a specific enzyme.

4. **Identifying the Correct Enzyme**: The enzyme responsible for synthesizing cDNA from mRNA is called reverse transcriptase. This enzyme synthesizes DNA from an RNA template, which is the reverse of the usual transcription process where DNA is used to synthesize RNA.

5. **Conclusion**: Therefore, the correct answer to the question is that cDNA probes are copied from mRNA molecules with the help of reverse transcriptase.

### Final Answer:
cDNA probes are copied from mRNA molecules with the help of **reverse transcriptase**.

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