Human insulin is made in yeast cell , yet its strcuture is absolutely identical to that of natural molecule.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks how human insulin can be produced in yeast cells while maintaining the same structure as natural human insulin.

2. **Genetic Engineering Process**: The production of human insulin in yeast involves genetic engineering. This is a method used to manipulate DNA to produce desired traits or products.

3. **Isolating the Insulin Gene**: The first step in this process is to isolate the gene responsible for producing human insulin. This gene is identified and extracted from human DNA.

4. **Inserting the Gene into a Plasmid**: Once the insulin gene is isolated, it is inserted into a plasmid. A plasmid is a small, circular piece of DNA that can replicate independently of chromosomal DNA. This plasmid acts as a vector to carry the insulin gene into the yeast cells.

5. **Transformation of Yeast Cells**: The genetically modified plasmid is then introduced into yeast cells through a process known as transformation. This allows the yeast cells to take up the plasmid containing the insulin gene.

6. **Yeast Cell Division and Insulin Production**: After the plasmid is successfully integrated into the yeast cells, these cells begin to divide rapidly. As they multiply, they use the instructions from the inserted insulin gene to produce human insulin.

7. **Identical Structure**: The insulin produced by the yeast cells is chemically identical to natural human insulin because the yeast cells utilize the same genetic code to synthesize the protein.

8. **Conclusion**: Therefore, the human insulin produced in yeast cells is structurally identical to the insulin produced in the human body, confirming the statement in the question.

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