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

Options

A. cDNA
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 refers to a piece of nucleic acid that can hybridize with another nucleic acid to identify the presence of a gene.

2. **Analyze the Options**:
- **Option A: cDNA** - This stands for complementary DNA, which is synthesized from RNA. While it is important in molecular biology, it does not specifically refer to a probe used for hybridization.
- **Option B: DNA Probe** - This is a piece of nucleic acid that is labeled and used to detect the presence of complementary sequences in a sample. It hybridizes with the target DNA to indicate the location of a gene.
- **Option C: Sticky End** - This refers to the ends of a DNA molecule that have been cut in a staggered manner, allowing them to easily bond with complementary sequences. It does not refer to a nucleic acid used for hybridization.
- **Option D: Blunt End** - This refers to the ends of a DNA molecule that have been cut straight across, resulting in no overhangs. Like sticky ends, this does not pertain to the identification of genes.

3. **Identify the Correct Answer**: Based on the analysis, the term that best fits the description of a piece of nucleic acid used to find out a gene by forming a hybrid with it is **DNA Probe**.

4. **Conclusion**: Therefore, the correct answer is **Option B: DNA Probe**.