Select the correct statement-

Options

A. genetic engineering works only on animals and has not yet been successfully used on plants.
B. There are no risks associated with DNA technology.
C. The first step in PCR is heat, is used to separate both the strands of target DNA.
D. DNA from one organism will not bond to DNA from another animal.

Answer

To solve the question, "Select the correct statement," we will analyze each of the provided options step by step.

### Step 1: Evaluate the First Statement
**Statement:** Genetic engineering works only on animals and has not yet been successful on plants.

**Analysis:** This statement is incorrect. Genetic engineering has been successfully applied to both animals and plants. A notable example is Bt cotton, which has been genetically modified to express a protein from Bacillus thuringiensis that provides resistance to certain pests.

**Conclusion:** This statement is false.

### Step 2: Evaluate the Second Statement
**Statement:** There are no risks associated with DNA technology.

**Analysis:** This statement is also incorrect. While DNA technology has many benefits, it is not without risks. There can be unintended consequences, such as ecological impacts or health risks associated with genetically modified organisms (GMOs).

**Conclusion:** This statement is false.

### Step 3: Evaluate the Third Statement
**Statement:** The first step in PCR (Polymerase Chain Reaction) is heat, which is used to separate both strands of target DNA.

**Analysis:** This statement is correct. The first step of PCR is denaturation, where heat is applied to separate the two strands of the DNA double helix. This process breaks the hydrogen bonds between the base pairs, allowing the strands to be accessed for amplification.

**Conclusion:** This statement is true.

### Step 4: Evaluate the Fourth Statement
**Statement:** DNA from one organism will not bond with the DNA from another animal.

**Analysis:** This statement is incorrect. DNA from different organisms can bond or recombine under certain conditions, especially in the context of genetic engineering and recombinant DNA technology.

**Conclusion:** This statement is false.

### Final Conclusion
After evaluating all the statements, the only correct statement is the third one regarding the first step in PCR.

**Answer:** The correct option is the third statement.

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