Find the incorrect statement with respect to genetic engineerig technique .

Options

A. A transformed host may contian a reombinant plasmed or a plasmid with only vector sequences
B. Due to insertional inactivation `beta` - galactosidase resistant gene of a plasmind becomes incative
C. Taq - polymerase in a thermostable enzyme
D. DNA fingerprint is the patter of DNA fragments on the gel

Answer

To solve the question "Find the incorrect statement with respect to genetic engineering technique," we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which statement among the given options is incorrect regarding genetic engineering techniques.

2. **Evaluate Each Option**:
- **Option A**: "A transformed host may contain a recombinant plasmid or a plasmid with only vector sequences."
- **Analysis**: This statement is incorrect. A transformed host should contain a recombinant plasmid, which includes the gene of interest. If it only has vector sequences, it is not considered transformed.

- **Option B**: "Due to insertional inactivation of beta-galactosidase, the resistant gene of a plasmid becomes inactive."
- **Analysis**: This statement is correct. Insertional inactivation occurs when a gene is interrupted by the insertion of a foreign DNA fragment, rendering it inactive.

- **Option C**: "TAP polymerase is a thermostable enzyme, which is also correct. It is used in PCR technique."
- **Analysis**: This statement is correct. Taq polymerase (often referred to as TAP polymerase) is indeed a thermostable enzyme used in the Polymerase Chain Reaction (PCR) process.

- **Option D**: "DNA fingerprint is the pattern of DNA fragment on the gel."
- **Analysis**: This statement is also correct. DNA fingerprinting involves analyzing the pattern of DNA fragments after gel electrophoresis.

3. **Identify the Incorrect Statement**: After evaluating all the options, we find that Option A is the incorrect statement regarding genetic engineering techniques.

### Final Answer:
The incorrect statement with respect to genetic engineering technique is **Option A**: "A transformed host may contain a recombinant plasmid or a plasmid with only vector sequences."

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