A piece of nucleic acid using to find out a gene, by forming hybrid with it, is called as

Options

A. `c -DNA`
B. DNA probe
C. Sticky end
D. Blunt end

Answer

To solve the question "A piece of nucleic acid used to find out a gene, by forming hybrid with it, is called as," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for a specific term that describes a piece of nucleic acid that can hybridize with a target gene to identify it.

2. **Identify Key Terms**: The key terms in the question are "piece of nucleic acid," "find out a gene," and "forming hybrid." This indicates that we are looking for a nucleic acid that can bind to another nucleic acid (the target gene).

3. **Evaluate the Options**:
- **Complementary DNA (cDNA)**: This is synthesized from mRNA and is not used for hybridization to find genes.
- **DNA Probes**: These are short sequences of nucleic acid that are complementary to the target DNA sequence and can hybridize with it. They are often labeled (radioactively or fluorescently) to allow for detection.
- **Sticky Ends**: These refer to the ends of DNA fragments that can easily join with complementary sticky ends of other DNA fragments. They are not used for hybridization to identify genes.
- **Blunt Ends**: These are the ends of DNA fragments that do not have overhangs and are also not used for hybridization.

4. **Select the Correct Answer**: Based on the evaluation, the correct answer is **DNA Probes**. They are specifically designed to hybridize with target DNA sequences to identify or locate specific genes.

5. **Final Answer**: A piece of nucleic acid used to find out a gene by forming a hybrid with it is called a **DNA Probe**.