Starting material for the production of insulin from bacteria is –
**Core Concept**
Insulin production in bacteria involves genetic engineering and recombinant DNA technology. The process begins with the isolation of a suitable starting material containing genetic information necessary for insulin production. This material is then inserted into a bacterial plasmid, enabling the bacteria to synthesize human insulin.
**Why the Correct Answer is Right**
The correct answer involves the use of a recombinant DNA technique to introduce human insulin genes into a bacterial plasmid. This is achieved by isolating the human insulin gene from a source such as a pancreas or a recombinant DNA library. The isolated gene is then inserted into a bacterial plasmid, which is a small, self-replicating circular DNA molecule found in bacteria. The plasmid is designed to express the human insulin gene, allowing the bacteria to synthesize the protein. This process is known as recombinant DNA technology and has revolutionized the production of therapeutic proteins, including insulin.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not involve the use of recombinant DNA technology or the introduction of human insulin genes into a bacterial plasmid.
**Option B:** This option is incorrect as it does not provide a suitable starting material for insulin production. The correct starting material is a source of human insulin genes, not a different type of genetic material.
**Option C:** This option is incorrect as it does not accurately describe the process of insulin production in bacteria. The correct process involves the use of recombinant DNA technology and the introduction of human insulin genes into a bacterial plasmid.
**Clinical Pearl / High-Yield Fact**
Recombinant DNA technology has enabled the mass production of human insulin, revolutionizing the treatment of diabetes mellitus. This technology involves the use of microorganisms such as bacteria or yeast to express human insulin genes, resulting in a cost-effective and efficient production process.
**Correct Answer: B. Genomic DNA from a human pancreas or a recombinant DNA library.**